The Internet Printing Protocol (IPP) is an application level protocol
that can be used for distributed printing using Internet tools and
technologies. IPP version 1.1 (IPP/1.1) focuses primarily on end
user functionality with a few administrative operations included.
This document is just one of a suite of documents that fully define
IPP. The full set of IPP documents includes:
Design Goals for an Internet Printing Protocol [RFC2567]
Rationale for the Structure and Model and Protocol for the Internet
Printing Protocol [RFC2568]
Internet Printing Protocol/1.1: Model and Semantics (this document)
Internet Printing Protocol/1.1: Encoding and Transport [RFC2910]
Internet Printing Protocol/1.1: Implementer's Guide [IPP-IIG]
Mapping between LPD and IPP Protocols [RFC2569]
Anyone reading these documents for the first time is strongly
encouraged to read the IPP documents in the above order.
This document is laid out as follows:
- The rest of Section 1 is an introduction to the IPP simplified
model for distributed printing.
- Section 2 introduces the object types covered in the model with
their basic behaviors, attributes, and interactions.
- Section 3 defines the operations included in IPP/1.1. IPP
operations are synchronous, therefore, for each operation, there is
a both request and a response.
- Section 4 defines the attributes (and their syntaxes) that are used
in the model.
- Sections 5 - 6 summarizes the implementation conformance
requirements for objects that support the protocol and IANA
considerations, respectively.
- Sections 7 - 11 cover the Internationalization and Security
considerations as well as References, Author contact information,
and Formats for Registration Proposals.
- Sections 12 - 14 are appendices that cover Terminology, Status
Codes and Messages, and "media" keyword values.
Note: This document uses terms such as "attributes", "keywords",
and "support". These terms have special meaning and are defined
in the model terminology section 12.2. Capitalized terms, such
as MUST, MUST NOT, REQUIRED, SHOULD, SHOULD NOT, MAY, NEED NOT,
and OPTIONAL, have special meaning relating to conformance.
These terms are defined in section 12.1 on conformance
terminology, most of which is taken from RFC 2119 [RFC2119].
Hastings, et al. Standards Track [Page 9]
RFC 2911 IPP/1.1: Model and Semantics September 2000
- Section 15 is an appendix that helps to clarify the effects of
interactions between related attributes and their values.
- Section 16 is an appendix that enumerates the subset of Printer
attributes that form a generic directory schema. These attributes
are useful when registering a Printer so that a client can find the
Printer not just by name, but by filtered searches as well.
- Section 17 is an appendix summarizing the additions and changes
from the IPP/1.0 "Model and Semantics" document [RFC2566] to make
this IPP/1.1 document.
- Section 18 is the full copyright notice.
In order to achieve its goal of realizing a workable printing
protocol for the Internet, the Internet Printing Protocol (IPP) is
based on a simplified printing model that abstracts the many
components of real world printing solutions. The Internet is a
distributed computing environment where requesters of print services
(clients, applications, printer drivers, etc.) cooperate and interact
with print service providers. This model and semantics document
describes a simple, abstract model for IPP even though the underlying
configurations may be complex "n-tier" client/server systems. An
important simplifying step in the IPP model is to expose only the key
objects and interfaces required for printing. The model described in
this model document does not include features, interfaces, and
relationships that are beyond the scope of the first version of IPP
(IPP/1.1). IPP/1.1 incorporates many of the relevant ideas and
lessons learned from other specification and development efforts
[HTPP] [ISO10175] [LDPA] [P1387.4] [PSIS] [RFC1179] [SWP]. IPP is
heavily influenced by the printing model introduced in the Document
Printing Application (DPA) [ISO10175] standard. Although DPA
specifies both end user and administrative features, IPP version 1.1
(IPP/1.1) focuses primarily on end user functionality with a few
additional OPTIONAL operator operations.
The IPP/1.1 model encapsulates the important components of
distributed printing into two object types:
- Printer (Section 2.1)
- Job (Section 2.2)
Each object type has an associated set of operations (see section 3)
and attributes (see section 4).
Hastings, et al. Standards Track [Page 10]
RFC 2911 IPP/1.1: Model and Semantics September 2000
It is important, however, to understand that in real system
implementations (which lie underneath the abstracted IPP/1.1 model),
there are other components of a print service which are not
explicitly defined in the IPP/1.1 model. The following figure
illustrates where IPP/1.1 fits with respect to these other
components.
+--------------+
| Application |
o +. . . . . . . |
\|/ | Spooler |
/ \ +. . . . . . . | +---------+
End-User | Print Driver |---| File |
+-----------+ +-----+ +------+-------+ +----+----+
| Browser | | GUI | | |
+-----+-----+ +--+--+ | |
| | | |
| +---+------------+---+ |
N D S | | IPP Client |------------+
O I E | +---------+----------+
T R C | |
I E U |
F C R -------------- Transport ------------------
I T I
C O T | --+
A R Y +--------+--------+ |
T Y | IPP Server | |
I +--------+--------+ |
O | |
N +-----------------+ | IPP Printer
| Print Service | |
+-----------------+ |
| --+
+-----------------+
| Output Device(s)|
+-----------------+
An IPP Printer object encapsulates the functions normally associated
with physical output devices along with the spooling, scheduling and
multiple device management functions often associated with a print
server. Printer objects are optionally registered as entries in a
directory where end users find and select them based on some sort of
filtered and context based searching mechanism (see section 16). The
directory is used to store relatively static information about the
Printer, allowing end users to search for and find Printers that
match their search criteria, for example: name, context, printer
capabilities, etc. The more dynamic information, such as state,
currently loaded and ready media, number of jobs at the Printer,
Hastings, et al. Standards Track [Page 11]
RFC 2911 IPP/1.1: Model and Semantics September 2000
errors, warnings, and so forth, is directly associated with the
Printer object itself rather than with the entry in the directory
which only represents the Printer object.
IPP clients implement the IPP protocol on the client side and give
end users (or programs running on behalf of end users) the ability to
query Printer objects and submit and manage print jobs. An IPP
server is just that part of the Printer object that implements the
server-side protocol. The rest of the Printer object implements (or
gateways into) the application semantics of the print service itself.
The Printer objects may be embedded in an output device or may be
implemented on a host on the network that communicates with an output
device.
When a job is submitted to the Printer object and the Printer object
validates the attributes in the submission request, the Printer
object creates a new Job object. The end user then interacts with
this new Job object to query its status and monitor the progress of
the job. An end user can also cancel their print jobs by using the
Job object's Cancel-Job operation. An end-user can also hold,
release, and restart their print jobs using the Job object's OPTIONAL
Hold-Job, Release-Job, and Restart-Job operations, if implemented.
A privileged operator or administrator of a Printer object can
cancel, hold, release, and restart any user's job using the REQUIRED
Cancel-Job and the OPTIONAL Hold-Job, Release-Job, and Restart-Job
operations. In additional privileged operator or administrator of a
Printer object can pause, resume, or purge (jobs from) a Printer
object using the OPTIONAL Pause-Printer, Resume-Printer, and Purge-
Jobs operations, if implemented.
The notification service is out of scope for this IPP/1.1 document,
but using such a notification service, the end user is able to
register for and receive Printer specific and Job specific events.
An end user can query the status of Printer objects and can follow
the progress of Job objects by polling using the Get-Printer-
Attributes, Get-Jobs, and Get-Job-Attributes operations.
The IPP/1.1 model introduces objects of type Printer and Job. Each
type of object models relevant aspects of a real-world entity such as
a real printer or real print job. Each object type is defined as a
set of possible attributes that may be supported by instances of that
object type. For each object (instance), the actual set of supported
attributes and values describe a specific implementation. The
object's attributes and values describe its state, capabilities,
realizable features, job processing functions, and default behaviors
Hastings, et al. Standards Track [Page 12]
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and characteristics. For example, the Printer object type is defined
as a set of attributes that each Printer object potentially supports.
In the same manner, the Job object type is defined as a set of
attributes that are potentially supported by each Job object.
Each attribute included in the set of attributes defining an object
type is labeled as:
- "REQUIRED": each object MUST support the attribute.
- "RECOMMENDED": each object SHOULD support the attribute.
- "OPTIONAL": each object MAY support the attribute.
Some definitions of attribute values indicate that an object MUST or
SHOULD support the value; otherwise, support of the value is
OPTIONAL.
However, if an implementation supports an attribute, it MUST support
at least one of the possible values for that attribute.
The major component of the IPP/1.1 model is the Printer object. A
Printer object implements the server-side of the IPP/1.1 protocol.
Using the protocol, end users may query the attributes of the Printer
object and submit print jobs to the Printer object. The actual
implementation components behind the Printer abstraction may take on
different forms and different configurations. However, the model
abstraction allows the details of the configuration of real
components to remain opaque to the end user. Section 3 describes
each of the Printer operations in detail.
The capabilities and state of a Printer object are described by its
attributes. Printer attributes are divided into two groups:
- "job-template" attributes: These attributes describe supported job
processing capabilities and defaults for the Printer object. (See
section 4.2)
- "printer-description" attributes: These attributes describe the
Printer object's identification, state, location, references to
other sources of information about the Printer object, etc. (see
section 4.4)
Since a Printer object is an abstraction of a generic document output
device and print service provider, a Printer object could be used to
represent any real or virtual device with semantics consistent with
the Printer object, such as a fax device, an imager, or even a CD
writer.
Hastings, et al. Standards Track [Page 13]
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Some examples of configurations supporting a Printer object include:
1) An output device with no spooling capabilities
2) An output device with a built-in spooler
3) A print server supporting IPP with one or more associated
output devices
3a) The associated output devices may or may not be capable of
spooling jobs
3b) The associated output devices may or may not support IPP
The following figures show some examples of how Printer objects can
be realized on top of various distributed printing configurations.
The embedded case below represents configurations 1 and 2. The hosted
and fan-out figures below represent configurations 3a and 3b.
In this document the term "client" refers to a software entity that
sends IPP operation requests to an IPP Printer object and accepts IPP
operation responses. A client MAY be:
1. contained within software controlled by an end user, e.g.
activated by the "Print" menu item in an application or
2. the print server component that sends IPP requests to either an
output device or another "downstream" print server.
The term "IPP Printer" is a network entity that accepts IPP operation
requests and returns IPP operation responses. As such, an IPP object
MAY be:
1. an (embedded) device component that accepts IPP requests and
controls the device or
2. a component of a print server that accepts IPP requests (where
the print server controls one or more networked devices using
IPP or other protocols).
Legend:
##### indicates a Printer object which is
either embedded in an output device or is
hosted in a server. The Printer object
might or might not be capable of queuing/spooling.
any indicates any network protocol or direct
connect, including IPP
Hastings, et al. Standards Track [Page 14]
RFC 2911 IPP/1.1: Model and Semantics September 2000
embedded printer:
output device
+---------------+
O +--------+ | ########### |
/|\ | client |------------IPP------------># Printer # |
/ \ +--------+ | # Object # |
| ########### |
+---------------+
hosted printer:
+---------------+
O +--------+ ########### | |
/|\ | client |--IPP--># Printer #-any->| output device |
/ \ +--------+ # Object # | |
########### +---------------+
+---------------+
fan out: | |
+-->| output device |
any/ | |
O +--------+ ########### / +---------------+
/|\ | client |-IPP-># Printer #--*
/ \ +--------+ # Object # \ +---------------+
########### any\ | |
+-->| output device |
| |
+---------------+
A Job object is used to model a print job. A Job object contains
documents. The information required to create a Job object is sent
in a create request from the end user via an IPP Client to the
Printer object. The Printer object validates the create request, and
if the Printer object accepts the request, the Printer object creates
the new Job object. Section 3 describes each of the Job operations
in detail.
The characteristics and state of a Job object are described by its
attributes. Job attributes are grouped into two groups as follows:
- "job-template" attributes: These attributes can be supplied by
the client or end user and include job processing instructions
which are intended to override any Printer object defaults
and/or instructions embedded within the document data. (See
section 4.2)
Hastings, et al. Standards Track [Page 15]
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- "job-description" attributes: These attributes describe the Job
object's identification, state, size, etc. The client supplies
some of these attributes, and the Printer object generates
others. (See section 4.3)
An implementation MUST support at least one document per Job object.
An implementation MAY support multiple documents per Job object. A
document is either:
- a stream of document data in a format supported by the Printer
object (typically a Page Description Language - PDL), or
- a reference to such a stream of document data
In IPP/1.1, a document is not modeled as an IPP object, therefore it
has no object identifier or associated attributes. All job
processing instructions are modeled as Job object attributes. These
attributes are called Job Template attributes and they apply equally
to all documents within a Job object.
IPP objects have relationships that are maintained persistently along
with the persistent storage of the object attributes.
A Printer object can represent either one or more physical output
devices or a logical device which "processes" jobs but never actually
uses a physical output device to put marks on paper. Examples of
logical devices include a Web page publisher or a gateway into an
online document archive or repository. A Printer object contains
zero or more Job objects.
A Job object is contained by exactly one Printer object, however the
identical document data associated with a Job object could be sent to
either the same or a different Printer object. In this case, a
second Job object would be created which would be almost identical to
the first Job object, however it would have new (different) Job
object identifiers (see section 2.4).
A Job object is either empty (before any documents have been added)
or contains one or more documents. If the contained document is a
stream of document data, that stream can be contained in only one
document. However, there can be identical copies of the stream in
other documents in the same or different Job objects. If the
contained document is just a reference to a stream of document data,
other documents (in the same or different Job object(s)) may contain
the same reference.
Hastings, et al. Standards Track [Page 16]
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All Printer and Job objects are identified by a Uniform Resource
Identifier (URI) [RFC2396] so that they can be persistently and
unambiguously referenced. Since every URL is a specialized form of a
URI, even though the more generic term URI is used throughout the
rest of this document, its usage is intended to cover the more
specific notion of URL as well.
An administrator configures Printer objects to either support or not
support authentication and/or message privacy using Transport Layer
Security (TLS) [RFC2246] (the mechanism for security configuration is
outside the scope of this IPP/1.1 document). In some situations,
both types of connections (both authenticated and unauthenticated)
can be established using a single communication channel that has some
sort of negotiation mechanism. In other situations, multiple
communication channels are used, one for each type of security
configuration. Section 8 provides a full description of all security
considerations and configurations.
If a Printer object supports more than one communication channel,
some or all of those channels might support and/or require different
security mechanisms. In such cases, an administrator could expose
the simultaneous support for these multiple communication channels as
multiple URIs for a single Printer object where each URI represents
one of the communication channels to the Printer object. To support
this flexibility, the IPP Printer object type defines a multi-valued
identification attribute called the "printer-uri-supported"
attribute. It MUST contain at least one URI. It MAY contain more
than one URI. That is, every Printer object will have at least one
URI that identifies at least one communication channel to the Printer
object, but it may have more than one URI where each URI identifies a
different communication channel to the Printer object. The
"printer-uri-supported" attribute has two companion attributes, the
"uri-security-supported" attribute and the "uri-authentication-
supported". Both have the same cardinality as "printer-uri-
supported". The purpose of the "uri-security-supported" attribute is
to indicate the security mechanisms (if any) used for each URI listed
in "printer-uri-supported". The purpose of the "uri-authentication-
supported" attribute is to indicate the authentication mechanisms (if
any) used for each URI listed in "printer-uri-supported". These
three attributes are fully described in sections 4.4.1, 4.4.2, and
4.4.3.
When a job is submitted to the Printer object via a create request,
the client supplies only a single Printer object URI. The client
supplied Printer object URI MUST be one of the values in the
"printer-uri-supported" Printer attribute.
Hastings, et al. Standards Track [Page 17]
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IPP/1.1 does not specify how the client obtains the client supplied
URI, but it is RECOMMENDED that a Printer object be registered as an
entry in a directory service. End-users and programs can then
interrogate the directory searching for Printers. Section 16 defines
a generic schema for Printer object entries in the directory service
and describes how the entry acts as a bridge to the actual IPP
Printer object. The entry in the directory that represents the IPP
Printer object includes the possibly many URIs for that Printer
object as values in one its attributes.
When a client submits a create request to the Printer object, the
Printer object validates the request and creates a new Job object.
The Printer object assigns the new Job object a URI which is stored
in the "job-uri" Job attribute. This URI is then used by clients as
the target for subsequent Job operations. The Printer object
generates a Job URI based on its configured security policy and the
URI used by the client in the create request.
For example, consider a Printer object that supports both a
communication channel secured by the use of SSL3 (using HTTP over
SSL3 with an "https" schemed URI) and another open communication
channel that is not secured with SSL3 (using a simple "http" schemed
URI). If a client were to submit a job using the secure URI, the
Printer object would assign the new Job object a secure URI as well.
If a client were to submit a job using the open-channel URI, the
Printer would assign the new Job object an open-channel URI.
In addition, the Printer object also populates the Job object's
"job-printer-uri" attribute. This is a reference back to the Printer
object that created the Job object. If a client only has access to a
Job object's "job-uri" identifier, the client can query the Job's
"job-printer-uri" attribute in order to determine which Printer
object created the Job object. If the Printer object supports more
than one URI, the Printer object picks the one URI supplied by the
client when creating the job to build the value for and to populate
the Job's "job-printer-uri" attribute.
Allowing Job objects to have URIs allows for flexibility and
scalability. For example, in some implementations, the Printer
object might create Jobs that are processed in the same local
environment as the Printer object itself. In this case, the Job URI
might just be a composition of the Printer's URI and some unique
component for the Job object, such as the unique 32-bit positive
integer mentioned later in this paragraph. In other implementations,
the Printer object might be a central clearing-house for validating
all Job object creation requests, but the Job object itself might be
created in some environment that is remote from the Printer object.
In this case, the Job object's URI may have no physical-location
Hastings, et al. Standards Track [Page 18]
RFC 2911 IPP/1.1: Model and Semantics September 2000
relationship at all to the Printer object's URI. Again, the fact
that Job objects have URIs allows for flexibility and scalability,
however, many existing printing systems have local models or
interface constraints that force print jobs to be identified using
only a 32-bit positive integer rather than an independent URI. This
numeric Job ID is only unique within the context of the Printer
object to which the create request was originally submitted.
Therefore, in order to allow both types of client access to IPP Job
objects (either by Job URI or by numeric Job ID), when the Printer
object successfully processes a create request and creates a new Job
object, the Printer object MUST generate both a Job URI and a Job ID.
The Job ID (stored in the "job-id" attribute) only has meaning in the
context of the Printer object to which the create request was
originally submitted. This requirement to support both Job URIs and
Job IDs allows all types of clients to access Printer objects and Job
objects no matter the local constraints imposed on the client
implementation.
In addition to identifiers, Printer objects and Job objects have
names ("printer-name" and "job-name"). An object name NEED NOT be
unique across all instances of all objects. A Printer object's name
is chosen and set by an administrator through some mechanism outside
the scope of this IPP/1.1 document. A Job object's name is
optionally chosen and supplied by the IPP client submitting the job.
If the client does not supply a Job object name, the Printer object
generates a name for the new Job object. In all cases, the name only
has local meaning.
To summarize:
- Each Printer object is identified with one or more URIs. The
Printer's "printer-uri-supported" attribute contains the URI(s).
- The Printer object's "uri-security-supported" attribute
identifies the communication channel security protocols that may
or may not have been configured for the various Printer object
URIs (e.g., 'tls' or 'none').
- The Printer object's "uri-authentication-supported" attribute
identifies the authentication mechanisms that may or may not
have been configured for the various Printer object URIs (e.g.,
'digest' or 'none').
- Each Job object is identified with a Job URI. The Job's "job-
uri" attribute contains the URI.
- Each Job object is also identified with Job ID which is a 32-
bit, positive integer. The Job's "job-id" attribute contains
the Job ID. The Job ID is only unique within the context of the
Printer object which created the Job object.
Hastings, et al. Standards Track [Page 19]
RFC 2911 IPP/1.1: Model and Semantics September 2000
- Each Job object has a "job-printer-uri" attribute which contains
the URI of the Printer object that was used to create the Job
object. This attribute is used to determine the Printer object
that created a Job object when given only the URI for the Job
object. This linkage is necessary to determine the languages,
charsets, and operations which are supported on that Job (the
basis for such support comes from the creating Printer object).
- Each Printer object has a name (which is not necessarily
unique). The administrator chooses and sets this name through
some mechanism outside the scope of this IPP/1.1 document. The
Printer object's "printer-name" attribute contains the name.
- Each Job object has a name (which is not necessarily unique).
The client optionally supplies this name in the create request.
If the client does not supply this name, the Printer object
generates a name for the Job object. The Job object's "job-name"
attribute contains the name.
IPP objects support operations. An operation consists of a request
and a response. When a client communicates with an IPP object, the
client issues an operation request to the URI for that object.
Operation requests and responses have parameters that identify the
operation. Operations also have attributes that affect the run-time
characteristics of the operation (the intended target, localization
information, etc.). These operation-specific attributes are called
operation attributes (as compared to object attributes such as
Printer object attributes or Job object attributes). Each request
carries along with it any operation attributes, object attributes,
and/or document data required to perform the operation. Each request
requires a response from the object. Each response indicates success
or failure of the operation with a status code as a response
parameter. The response contains any operation attributes, object
attributes, and/or status messages generated during the execution of
the operation request.
This section describes the semantics of the IPP operations, both
requests and responses, in terms of the parameters, attributes, and
other data associated with each operation.
Hastings, et al. Standards Track [Page 20]
RFC 2911 IPP/1.1: Model and Semantics September 2000
The IPP/1.1 Printer operations are:
Print-Job (section 3.2.1)
Print-URI (section 3.2.2)
Validate-Job (section 3.2.3)
Create-Job (section 3.2.4)
Get-Printer-Attributes (section 3.2.5)
Get-Jobs (section 3.2.6)
Pause-Printer (section 3.3.5)
Resume-Printer (section 3.3.6)
Purge-Jobs (section 3.3.7)
The Job operations are:
Send-Document (section 3.3.1)
Send-URI (section 3.3.2)
Cancel-Job (section 3.3.3)
Get-Job-Attributes (section 3.3.4)
Hold-Job (section 3.3.5)
Release-Job (section 3.3.6)
Restart-Job (section 3.3.7)
The Send-Document and Send-URI Job operations are used to add a new
document to an existing multi-document Job object created using the
Create-Job operation.
All IPP operations require some common parameters and operation
attributes. These common elements and their semantic characteristics
are defined and described in more detail in the following sections.
Every operation request contains the following REQUIRED parameters:
- a "version-number",
- an "operation-id",
- a "request-id", and
- the attributes that are REQUIRED for that type of request.
Every operation response contains the following REQUIRED parameters:
- a "version-number",
- a "status-code",
- the "request-id" that was supplied in the corresponding request,
and
- the attributes that are REQUIRED for that type of response.
Hastings, et al. Standards Track [Page 21]
RFC 2911 IPP/1.1: Model and Semantics September 2000
The "Encoding and Transport" document [RFC2910] defines special rules
for the encoding of these parameters. All other operation elements
are represented using the more generic encoding rules for attributes
and groups of attributes.
Each IPP operation request includes an identifying "operation-id"
value. Valid values are defined in the "operations-supported"
Printer attribute section (see section 4.4.15). The client specifies
which operation is being requested by supplying the correct
"operation-id" value.
In addition, every invocation of an operation is identified by a
"request-id" value. For each request, the client chooses the
"request-id" which MUST be an integer (possibly unique depending on
client requirements) in the range from 1 to 2**31 - 1 (inclusive).
This "request-id" allows clients to manage multiple outstanding
requests. The receiving IPP object copies all 32-bits of the client-
supplied "request-id" attribute into the response so that the client
can match the response with the correct outstanding request, even if
the "request-id" is out of range. If the request is terminated
before the complete "request-id" is received, the IPP object rejects
the request and returns a response with a "request-id" of 0.
Note: In some cases, the transport protocol underneath IPP might be a
connection oriented protocol that would make it impossible for a
client to receive responses in any order other than the order in
which the corresponding requests were sent. In such cases, the
"request-id" attribute would not be essential for correct protocol
operation. However, in other mappings, the operation responses can
come back in any order. In these cases, the "request-id" would be
essential.
Operation requests and responses are both composed of groups of
attributes and/or document data. The attributes groups are:
- Operation Attributes: These attributes are passed in the
operation and affect the IPP object's behavior while processing
the operation request and may affect other attributes or groups
of attributes. Some operation attributes describe the document
data associated with the print job and are associated with new
Job objects, however most operation attributes do not persist
beyond the life of the operation. The description of each
operation attribute includes conformance statements indicating
which operation attributes are REQUIRED and which are OPTIONAL
Hastings, et al. Standards Track [Page 22]
RFC 2911 IPP/1.1: Model and Semantics September 2000
for an IPP object to support and which attributes a client MUST
supply in a request and an IPP object MUST supply in a response.
- Job Template Attributes: These attributes affect the processing
of a job. A client OPTIONALLY supplies Job Template Attributes
in a create request, and the receiving object MUST be prepared
to receive all supported attributes. The Job object can later
be queried to find out what Job Template attributes were
originally requested in the create request, and such attributes
are returned in the response as Job Object Attributes. The
Printer object can be queried about its Job Template attributes
to find out what type of job processing capabilities are
supported and/or what the default job processing behaviors are,
though such attributes are returned in the response as Printer
Object Attributes. The "ipp-attribute-fidelity" operation
attribute affects processing of all client-supplied Job Template
attributes (see sections 3.2.1.2 and 15 for a full description
of "ipp-attribute-fidelity" and its relationship to other
attributes).
- Job Object Attributes: These attributes are returned in response
to a query operation directed at a Job object.
- Printer Object Attributes: These attributes are returned in
response to a query operation directed at a Printer object.
- Unsupported Attributes: In a create request, the client supplies
a set of Operation and Job Template attributes. If any of these
attributes or their values is unsupported by the Printer object,
the Printer object returns the set of unsupported attributes in
the response. Sections 3.1.7, 3.2.1.2, and 15 give a full
description of how Job Template attributes supplied by the
client in a create request are processed by the Printer object
and how unsupported attributes are returned to the client.
Because of extensibility, any IPP object might receive a request
that contains new or unknown attributes or values for which it
has no support. In such cases, the IPP object processes what it
can and returns the unsupported attributes in the response. The
Unsupported Attribute group is defined for all operation
responses for returning unsupported attributes that the client
supplied in the request.
Later in this section, each operation is formally defined by
identifying the allowed and expected groups of attributes for each
request and response. The model identifies a specific order for each
group in each request or response, but the attributes within each
group may be in any order, unless specified otherwise.
The attributes within a group MUST be unique; if an attribute with
the same name occurs more than once, the group is mal-formed.
Clients MUST NOT submit such malformed requests and Printers MUST NOT
return such malformed responses. If such a malformed request is
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submitted to a Printer, the Printer MUST either (1) reject the
request with the 'client-error-bad-request' status code (see section
13.1.4.1) or (2) process the request normally after selecting only
one of the attribute instances, depending on implementation. Which
attribute is selected when there are duplicate attributes depends on
implementation. The IPP Printer MUST NOT use the values from more
than one such duplicate attribute instance.
Each attribute definition includes the attribute's name followed by
the name of its attribute syntax(es) in parenthesizes. In addition,
each 'integer' attribute is followed by the allowed range in
parentheses, (m:n), for values of that attribute. Each 'text' or
'name' attribute is followed by the maximum size in octets in
parentheses, (size), for values of that attribute. For more details
on attribute syntax notation, see the descriptions of these
attributes syntaxes in section 4.1.
Note: Document data included in the operation is not strictly an
attribute, but it is treated as a special attribute group for
ordering purposes. The only operations that support supplying the
document data within an operation request are Print-Job and Send-
Document. There are no operation responses that include document
data.
Some operations are REQUIRED for IPP objects to support; the others
are OPTIONAL (see section 5.2.2). Therefore, before using an
OPTIONAL operation, a client SHOULD first use the REQUIRED Get-
Printer-Attributes operation to query the Printer's "operations-
supported" attribute in order to determine which OPTIONAL Printer and
Job operations are actually supported. The client SHOULD NOT use an
OPTIONAL operation that is not supported. When an IPP object
receives a request to perform an operation it does not support, it
returns the 'server-error-operation-not-supported' status code (see
section 13.1.5.2). An IPP object is non-conformant if it does not
support a REQUIRED operation.
Some Job and Printer attributes have values that are text strings and
names intended for human understanding rather than machine
understanding (see the 'text' and 'name' attribute syntax
descriptions in section 4.1). The following sections describe two
special Operation Attributes called "attributes-charset" and
"attributes-natural-language". These attributes are always part of
the Operation Attributes group. For most attribute groups, the order
of the attributes within the group is not important. However, for
these two attributes within the Operation Attributes group, the order
is critical. The "attributes-charset" attribute MUST be the first
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attribute in the group and the "attributes-natural-language"
attribute MUST be the second attribute in the group. In other words,
these attributes MUST be supplied in every IPP request and response,
they MUST come first in the group, and MUST come in the specified
order. For job creation operations, the IPP Printer implementation
saves these two attributes with the new Job object as Job Description
attributes. For the sake of brevity in this document, these
operation attribute descriptions are not repeated with every
operation request and response, but have a reference back to this
section instead.
The client MUST supply and the Printer object MUST support the
following REQUIRED operation attributes in every IPP/1.1 operation
request:
"attributes-charset" (charset):
This operation attribute identifies the charset (coded
character set and encoding method) used by any 'text' and
'name' attributes that the client is supplying in this request.
It also identifies the charset that the Printer object MUST use
(if supported) for all 'text' and 'name' attributes and status
messages that the Printer object returns in the response to
this request. See Sections 4.1.1 and 4.1.2 for the definition
of the 'text' and 'name' attribute syntaxes.
All clients and IPP objects MUST support the 'utf-8' charset
[RFC2279] and MAY support additional charsets provided that
they are registered with IANA [IANA-CS]. If the Printer object
does not support the client supplied charset value, the Printer
object MUST reject the request, set the "attributes-charset" to
'utf-8' in the response, and return the 'client-error-charset-
not-supported' status code and any 'text' or 'name' attributes
using the 'utf-8' charset. The Printer NEED NOT return any
attributes in the Unsupported Attributes Group (See sections
3.1.7 and 3.2.1.2). The Printer object MUST indicate the
charset(s) supported as the values of the "charset-supported"
Printer attribute (see Section 4.4.18), so that the client can
query to determine which charset(s) are supported.
Note to client implementers: Since IPP objects are only
required to support the 'utf-8' charset, in order to maximize
interoperability with multiple IPP object implementations, a
client may want to supply 'utf-8' in the "attributes-charset"
operation attribute, even though the client is only passing and
able to present a simpler charset, such as US-ASCII [ASCII] or
ISO-8859-1 [ISO8859-1]. Then the client will have to filter
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out (or charset convert) those characters that are returned in
the response that it cannot present to its user. On the other
hand, if both the client and the IPP objects also support a
charset in common besides utf-8, the client may want to use
that charset in order to avoid charset conversion or data loss.
See the 'charset' attribute syntax description in Section 4.1.7
for the syntax and semantic interpretation of the values of
this attribute and for example values.
"attributes-natural-language" (naturalLanguage):
This operation attribute identifies the natural language used
by any 'text' and 'name' attributes that the client is
supplying in this request. This attribute also identifies the
natural language that the Printer object SHOULD use for all
'text' and 'name' attributes and status messages that the
Printer object returns in the response to this request. See
the 'naturalLanguage' attribute syntax description in section
4.1.8 for the syntax and semantic interpretation of the values
of this attribute and for example values.
There are no REQUIRED natural languages required for the
Printer object to support. However, the Printer object's
"generated-natural-language-supported" attribute identifies the
natural languages supported by the Printer object and any
contained Job objects for all text strings generated by the IPP
object. A client MAY query this attribute to determine which
natural language(s) are supported for generated messages.
For any of the attributes for which the Printer object
generates text, i.e., for the "job-state-message", "printer-
state-message", and status messages (see Section 3.1.6), the
Printer object MUST be able to generate these text strings in
any of its supported natural languages. If the client requests
a natural language that is not supported, the Printer object
MUST return these generated messages in the Printer's
configured natural language as specified by the Printer's
"natural-language-configured" attribute" (see Section 4.4.19).
For other 'text' and 'name' attributes supplied by the client,
authentication system, operator, system administrator, or
manufacturer (i.e., for "job-originating-user-name", "printer-
name" (name), "printer-location" (text), "printer-info" (text),
and "printer-make-and-model" (text)), the Printer object is
only required to support the configured natural language of the
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Printer identified by the Printer object's "natural-language-
configured" attribute, though support of additional natural
languages for these attributes is permitted.
For any 'text' or 'name' attribute in the request that is in a
different natural language than the value supplied in the
"attributes-natural-language" operation attribute, the client
MUST use the Natural Language Override mechanism (see sections
4.1.1.2 and 4.1.2.2) for each such attribute value supplied.
The client MAY use the Natural Language Override mechanism
redundantly, i.e., use it even when the value is in the same
natural language as the value supplied in the "attributes-
natural-language" operation attribute of the request.
The IPP object MUST accept any natural language and any Natural
Language Override, whether the IPP object supports that natural
language or not (and independent of the value of the "ipp-
attribute-fidelity" Operation attribute). That is the IPP
object accepts all client supplied values no matter what the
values are in the Printer object's "generated-natural-
language-supported" attribute. That attribute, "generated-
natural-language-supported", only applies to generated
messages, not client supplied messages. The IPP object MUST
remember that natural language for all client-supplied
attributes, and when returning those attributes in response to
a query, the IPP object MUST indicate that natural language.
Each value whose attribute syntax type is 'text' or 'name' (see
sections 4.1.1 and 4.1.2) has an Associated Natural-Language.
This document does not specify how this association is stored
in a Printer or Job object. When such a value is encoded in a
request or response, the natural language is either implicit or
explicit:
- In the implicit case, the value contains only the text/name
value, and the language is specified by the "attributes-
natural-language" operation attribute in the request or
response (see sections 4.1.1.1 textWithoutLanguage and
4.1.2.1 nameWithoutLanguage).
- In the explicit case (also known as the Natural-Language
Override case), the value contains both the language and the
text/name value (see sections 4.1.1.2 textWithLanguage and
4.1.2.2 nameWithLanguage).
For example, the "job-name" attribute MAY be supplied by the
client in a create request. The text value for this attribute
will be in the natural language identified by the "attribute-
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natural-language" attribute, or if different, as identified by
the Natural Language Override mechanism. If supplied, the IPP
object will use the value of the "job-name" attribute to
populate the Job object's "job-name" attribute. Whenever any
client queries the Job object's "job-name" attribute, the IPP
object returns the attribute as stored and uses the Natural
Language Override mechanism to specify the natural language, if
it is different from that reported in the "attributes-natural-
language" operation attribute of the response. The IPP object
MAY use the Natural Language Override mechanism redundantly,
i.e., use it even when the value is in the same natural
language as the value supplied in the "attributes-natural-
language" operation attribute of the response.
An IPP object MUST NOT reject a request based on a supplied
natural language in an "attributes-natural-language" Operation
attribute or in any attribute that uses the Natural Language
Override.
Clients SHOULD NOT supply 'text' or 'name' attributes that use an
illegal combination of natural language and charset. For example,
suppose a Printer object supports charsets 'utf-8', 'iso-8859-1', and
'iso-8859-7'. Suppose also, that it supports natural languages 'en'
(English), 'fr' (French), and 'el' (Greek). Although the Printer
object supports the charset 'iso-8859-1' and natural language 'el',
it probably does not support the combination of Greek text strings
using the 'iso-8859-1' charset. The Printer object handles this
apparent incompatibility differently depending on the context in
which it occurs:
- In a create request: If the client supplies a text or name
attribute (for example, the "job-name" operation attribute) that
uses an apparently incompatible combination, it is a client
choice that does not affect the Printer object or its correct
operation. Therefore, the Printer object simply accepts the
client supplied value, stores it with the Job object, and
responds back with the same combination whenever the client (or
any client) queries for that attribute.
- In a query-type operation, like Get-Printer-Attributes: If the
client requests an apparently incompatible combination, the
Printer object responds (as described in section 3.1.4.2) using
the Printer's configured natural language rather than the
natural language requested by the client.
In either case, the Printer object does not reject the request
because of the apparent incompatibility. The potential incompatible
combination of charset and natural language can occur either at the
global operation level or at the Natural Language Override
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attribute-by-attribute level. In addition, since the response always
includes explicit charset and natural language information, there is
never any question or ambiguity in how the client interprets the
response.
The Printer object MUST supply and the client MUST support the
following REQUIRED operation attributes in every IPP/1.1 operation
response:
"attributes-charset" (charset):
This operation attribute identifies the charset used by any
'text' and 'name' attributes that the Printer object is
returning in this response. The value in this response MUST be
the same value as the "attributes-charset" operation attribute
supplied by the client in the request. If this is not possible
(i.e., the charset requested is not supported), the request
would have been rejected. See "attributes-charset" described
in Section 3.1.4.1 above.
If the Printer object supports more than just the 'utf-8'
charset, the Printer object MUST be able to code convert
between each of the charsets supported on a highest fidelity
possible basis in order to return the 'text' and 'name'
attributes in the charset requested by the client. However,
some information loss MAY occur during the charset conversion
depending on the charsets involved. For example, the Printer
object may convert from a UTF-8 'a' to a US-ASCII 'a' (with no
loss of information), from an ISO Latin 1 CAPITAL LETTER A WITH
ACUTE ACCENT to US-ASCII 'A' (losing the accent), or from a
UTF-8 Japanese Kanji character to some ISO Latin 1 error
character indication such as '?', decimal code equivalent, or
to the absence of a character, depending on implementation.
Whether an implementation that supports more than one charset
stores the data in the charset supplied by the client or code
converts to one of the other supported charsets, depends on
implementation. The strategy should try to minimize loss of
information during code conversion. On each response, such an
implementation converts from its internal charset to that
requested.
"attributes-natural-language" (naturalLanguage):
This operation attribute identifies the natural language used
by any 'text' and 'name' attributes that the IPP object is
returning in this response. Unlike the "attributes-charset"
operation attribute, the IPP object NEED NOT return the same
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value as that supplied by the client in the request. The IPP
object MAY return the natural language of the Job object or the
Printer's configured natural language as identified by the
Printer object's "natural-language-configured" attribute,
rather than the natural language supplied by the client. For
any 'text' or 'name' attribute or status message in the
response that is in a different natural language than the value
returned in the "attributes-natural-language" operation
attribute, the IPP object MUST use the Natural Language
Override mechanism (see sections 4.1.1.2 and 4.1.2.2) on each
attribute value returned. The IPP object MAY use the Natural
Language Override mechanism redundantly, i.e., use it even when
the value is in the same natural language as the value supplied
in the "attributes-natural-language" operation attribute of the
response.
All IPP operations are directed at IPP objects. For Printer
operations, the operation is always directed at a Printer object
using one of its URIs (i.e., one of the values in the Printer
object's "printer-uri-supported" attribute). Even if the Printer
object supports more than one URI, the client supplies only one URI
as the target of the operation. The client identifies the target
object by supplying the correct URI in the "printer-uri (uri)"
operation attribute.
For Job operations, the operation is directed at either:
- The Job object itself using the Job object's URI. In this case,
the client identifies the target object by supplying the correct
URI in the "job-uri (uri)" operation attribute.
- The Printer object that created the Job object using both the
Printer objects URI and the Job object's Job ID. Since the
Printer object that created the Job object generated the Job ID,
it MUST be able to correctly associate the client supplied Job
ID with the correct Job object. The client supplies the Printer
object's URI in the "printer-uri (uri)" operation attribute and
the Job object's Job ID in the "job-id (integer(1:MAX))"
operation attribute.
If the operation is directed at the Job object directly using the Job
object's URI, the client MUST NOT include the redundant "job-id"
operation attribute.
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The operation target attributes are REQUIRED operation attributes
that MUST be included in every operation request. Like the charset
and natural language attributes (see section 3.1.4), the operation
target attributes are specially ordered operation attributes. In all
cases, the operation target attributes immediately follow the
"attributes-charset" and "attributes-natural-language" attributes
within the operation attribute group, however the specific ordering
rules are:
- In the case where there is only one operation target attribute
(i.e., either only the "printer-uri" attribute or only the
"job-uri" attribute), that attribute MUST be the third attribute
in the operation attributes group.
- In the case where Job operations use two operation target
attributes (i.e., the "printer-uri" and "job-id" attributes),
the "printer-uri" attribute MUST be the third attribute and the
"job-id" attribute MUST be the fourth attribute.
In all cases, the target URIs contained within the body of IPP
operation requests and responses must be in absolute format rather
than relative format (a relative URL identifies a resource with the
scope of the HTTP server, but does not include scheme, host or port).
The following rules apply to the use of port numbers in URIs that
identify IPP objects:
1. If the URI scheme allows the port number to be explicitly
included in the URI string, and a port number is specified
within the URI, then that port number MUST be used by the
client to contact the IPP object.
2. If the URI scheme allows the port number to be explicitly
included in the URI string, and a port number is not specified
within the URI, then default port number implied by that URI
scheme MUST be used by the client to contact the IPP object.
3. If the URI scheme does not allow an explicit port number to be
specified within the URI, then the default port number implied
by that URI MUST be used by the client to contact the IPP
object.
Note: The IPP "Encoding and Transport document [RFC2910] shows a
mapping of IPP onto HTTP/1.1 [RFC2616] and defines a new default port
number for using IPP over HTTP/1.1.
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Every operation response includes a REQUIRED "status-code" parameter
and an OPTIONAL "status-message" operation attribute, and an OPTIONAL
"detailed-status-message" operation attribute. The Print-URI and
Send-URI response MAY include an OPTIONAL "document-access-error"
operation attribute.
The REQUIRED "status-code" parameter provides information on the
processing of a request.
The status code is intended for use by automata. A client
implementation of IPP SHOULD convert status code values into any
localized message that has semantic meaning to the end user.
The "status-code" value is a numeric value that has semantic meaning.
The "status-code" syntax is similar to a "type2 enum" (see section
4.1 on "Attribute Syntaxes") except that values can range only from
0x0000 to 0x7FFF. Section 13 describes the status codes, assigns the
numeric values, and suggests a corresponding status message for each
status code for use by the client when the user's natural language is
English.
If the Printer performs an operation with no errors and it encounters
no problems, it MUST return the status code 'successful-ok' in the
response. See section 13.
If the client supplies unsupported values for the following
parameters or Operation attributes, the Printer object MUST reject
the operation, NEED NOT return the unsupported attribute value in the
Unsupported Attributes group, and MUST return the indicated status
code:
Parameter/Attribute Status code
version-number server-error-version-not-supported
operation-id server-error-operation-not-supported
attributes-charset client-error-charset-not-supported
compression client-error-compression-not-supported
document-format client-error-document-format-not-supported
document-uri client-error-uri-scheme-not-supported,
client-error-document-access-error
If the client supplies unsupported values for other attributes, or
unsupported attributes, the Printer returns the status code defined
in section 3.1.7 on Unsupported Attributes.
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The OPTIONAL "status-message" operation attribute provides a short
textual description of the status of the operation. The "status-
message" attribute's syntax is "text(255)", so the maximum length is
255 octets (see section 4.1.1). The status message is intended for
the human end user. If a response does include a "status-message"
attribute, an IPP client NEED NOT examine or display the messages,
however it SHOULD do so in some implementation specific manner. The
"status-message" is especially useful for a later version of a
Printer object to return as supplemental information for the human
user to accompany a status code that an earlier version of a client
might not understand.
If the Printer object supports the "status-message" operation
attribute, the Printer object MUST be able to generate this message
in any of the natural languages identified by the Printer object's
"generated-natural-language-supported" attribute (see the
"attributes-natural-language" operation attribute specified in
section 3.1.4.1. Section 13 suggests the text for the status message
returned by the Printer for use with the English natural language.
As described in section 3.1.4.1 for any returned 'text' attribute, if
there is a choice for generating this message, the Printer object
uses the natural language indicated by the value of the "attributes-
natural-language" in the client request if supported, otherwise the
Printer object uses the value in the Printer object's own "natural-
language-configured" attribute.
If the Printer object supports the "status-message" operation
attribute, it SHOULD use the REQUIRED 'utf-8' charset to return a
status message for the following error status codes (see section 13):
'client-error-bad-request', 'client-error-charset-not-supported',
'server-error-internal-error', 'server-error-operation-not-
supported', and 'server-error-version-not-supported'. In this case,
it MUST set the value of the "attributes-charset" operation attribute
to 'utf-8' in the error response.
The OPTIONAL "detailed-status-message" operation attribute provides
additional more detailed technical and implementation-specific
information about the operation. The "detailed-status-message"
attribute's syntax is "text(MAX)", so the maximum length is 1023
octets (see section 4.1.1). If the Printer objects supports the
"detailed-status-message" operation attribute, the Printer NEED NOT
localize the message, since it is intended for use by the system
administrator or other experienced technical persons. Localization
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might obscure the technical meaning of such messages. Clients MUST
NOT attempt to parse the value of this attribute. See the
"document-access-error" operation attribute (section 3.1.6.4) for
additional errors that a program can process.
This OPTIONAL operation attribute provides additional information
about any document access errors encountered by the Printer before it
returned a response to the Print-URI (section 3.2.2) or Send-URI
(section 3.3.1) operation. For errors in the protocol identified by
the URI scheme in the "document-uri" operation attribute, such as
'http:' or 'ftp:', the error code is returned in parentheses,
followed by the URI. For example:
(404) http://ftp.pwg.org/pub/pwg/ipp/new_MOD/ipp-model-v11.pdf
Most Internet protocols use decimal error codes (unlike IPP), so the
ASCII error code representation is in decimal.
The Unsupported Attributes group contains attributes that are not
supported by the operation. This group is primarily for the job
creation operations, but all operations can return this group.
A Printer object MUST include an Unsupported Attributes group in a
response if the status code is one of the following: 'successful-
ok-ignored-or-substituted-attributes', 'successful-ok-conflicting-
attributes', 'client-error-attributes-or-values-not-supported' or
'client-error-conflicting-attributes'.
If the status code is one of the four specified in the preceding
paragraph, the Unsupported Attributes group MUST contain all of those
attributes and only those attributes that are:
a. an Operation or Job Template attribute supplied in the request,
and
b. unsupported by the printer. See below for details on the three
categories "unsupported" attributes.
If the status code is one of those in the table in section 3.1.6.1,
the Unsupported Attributes group NEED NOT contain the unsupported
parameter or attribute indicated in that table.
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If the Printer object is not returning any Unsupported Attributes in
the response, the Printer object SHOULD omit Group 2 rather than
sending an empty group. However, a client MUST be able to accept an
empty group.
Unsupported attributes fall into three categories:
1. The Printer object does not support the supplied attribute (no
matter what the attribute syntax or value).
2. The Printer object does support the attribute, but does not
support some or all of the particular attribute syntaxes or
values supplied by the client (i.e., the Printer object does
not have those attribute syntaxes or values in its
corresponding "xxx-supported" attribute).
3. The Printer object does support the attributes and values
supplied, but the particular values are in conflict with one
another, because they violate a constraint, such as not being
able to staple transparencies.
In the case of an unsupported attribute name, the Printer object
returns the client-supplied attribute with a substituted value of
'unsupported'. This value's syntax type is "out-of-band" and its
encoding is defined by special rules for "out-of-band" values in the
"Encoding and Transport" document [RFC2910]. Its value indicates no
support for the attribute itself (see the beginning of section 4.1).
In the case of a supported attribute with one or more unsupported
attribute syntaxes or values, the Printer object simply returns the
client-supplied attribute with the unsupported attribute syntaxes or
values as supplied by the client. This indicates support for the
attribute, but no support for that particular attribute syntax or
value. If the client supplies a multi-valued attribute with more
than one value and the Printer object supports the attribute but only
supports a subset of the client-supplied attribute syntaxes or
values, the Printer object
MUST return only those attribute syntaxes or values that are
unsupported.
In the case of two (or more) supported attribute values that are in
conflict with one another (although each is supported independently,
the values conflict when requested together within the same job), the
Printer object MUST return all the values that it ignores or
substitutes to resolve the conflict, but not any of the values that
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it is still using. The choice for exactly how to resolve the
conflict is implementation dependent. See sections 3.2.1.2 and 15.
See The Implementer's Guide [IPP-IIG] for an example.
Each operation request and response carries with it a "version-
number" parameter. Each value of the "version-number" is in the form
"X.Y" where X is the major version number and Y is the minor version
number. By including a version number in the client request, it
allows the client to identify which version of IPP it is interested
in using, i.e., the version whose conformance requirements the client
may be depending upon the Printer to meet.
If the IPP object does not support that major version number supplied
by the client, i.e., the major version field of the "version-number"
parameter does not match any of the values of the Printer's "ipp-
versions-supported" (see section 4.4.14), the object MUST respond
with a status code of 'server-error-version-not-supported' along with
the closest version number that is supported (see section 13.1.5.4).
If the major version number is supported, but the minor version
number is not, the IPP object SHOULD accept and attempt to perform
the request (or reject the request if the operation is not
supported), else it rejects the request and returns the 'server-
error-version-not-supported' status code. In all cases, the IPP
object MUST return the "version-number" that it supports that is
closest to the version number supplied by the client in the request.
There is no version negotiation per se. However, if after receiving
a 'server-error-version-not-supported' status code from an IPP
object, a client SHOULD try again with a different version number. A
client MAY also determine the versions supported either from a
directory that conforms to Appendix E (see section 16) or by querying
the Printer object's "ipp-versions-supported" attribute (see section
4.4.14) to determine which versions are supported.
An IPP object implementation MUST support version '1.1', i.e., meet
the conformance requirements for IPP/1.1 as specified in this
document and [RFC2910]. It is recommended that IPP object
implementations accept any request with the major version '1' (or
reject the request if the operation is not supported).
There is only one notion of "version number" that covers both IPP
Model and IPP Protocol changes. Thus the version number MUST change
when introducing a new version of the Model and Semantics document
(this document) or a new version of the "Encoding and Transport"
document [RFC2910].
Hastings, et al. Standards Track [Page 36]
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Changes to the major version number of the Model and Semantics
document indicate structural or syntactic changes that make it
impossible for older version of IPP clients and Printer objects to
correctly parse and correctly process the new or changed attributes,
operations and responses. If the major version number changes, the
minor version numbers is set to zero. As an example, adding the
REQUIRED "ipp-attribute-fidelity" attribute to version '1.1' (if it
had not been part of version '1.0'), would have required a change to
the major version number, since an IPP/1.0 Printer would not have
processed a request with the correct semantics that contained the
"ipp-attribute-fidelity" attribute that it did not know about. Items
that might affect the changing of the major version number include
any changes to the Model and Semantics document (this document) or
the "Encoding and Transport" document [RFC2910] itself, such as:
- reordering of ordered attributes or attribute sets
- changes to the syntax of existing attributes
- adding REQUIRED (for an IPP object to support) operation
attribute groups
- adding values to existing REQUIRED operation attributes
- adding REQUIRED operations
Changes to the minor version number indicate the addition of new
features, attributes and attribute values that may not be understood
by all IPP objects, but which can be ignored if not understood.
Items that might affect the changing of the minor version number
include any changes to the model objects and attributes but not the
encoding and transport rules [RFC2910] (except adding attribute
syntaxes). Examples of such changes are:
- grouping all extensions not included in a previous version into
a new version
- adding new attribute values
- adding new object attributes
- adding OPTIONAL (for an IPP object to support) operation
attributes (i.e., those attributes that an IPP object can ignore
without confusing clients)
- adding OPTIONAL (for an IPP object to support) operation
attribute groups (i.e., those attributes that an IPP object can
ignore without confusing clients)
- adding new attribute syntaxes
- adding OPTIONAL operations
- changing Job Description attributes or Printer Description
attributes from OPTIONAL to REQUIRED or vice versa.
- adding OPTIONAL attribute syntaxes to an existing attribute.
The encoding of the "version-number" MUST NOT change over any version
number (either major or minor). This rule guarantees that all future
Hastings, et al. Standards Track [Page 37]
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versions will be backwards compatible with all previous versions (at
least for checking the "version-number"). In addition, any protocol
elements (attributes, error codes, tags, etc.) that are not carried
forward from one version to the next are deprecated so that they can
never be reused with new semantics.
Implementations that support a certain version NEED NOT support ALL
previous versions. As each new version is defined (through the
release of a new IPP specification document), that version will
specify which previous versions MUST and which versions SHOULD be
supported in compliant implementations.
In order to "submit a print job" and create a new Job object, a
client issues a create request. A create request is any one of
following three operation requests:
- The Print-Job Request: A client that wants to submit a print job
with only a single document uses the Print-Job operation. The
operation allows for the client to "push" the document data to
the Printer object by including the document data in the request
itself.
- The Print-URI Request: A client that wants to submit a print job
with only a single document (where the Printer object "pulls"
the document data instead of the client "pushing" the data to
the Printer object) uses the Print-URI operation. In this
case, the client includes in the request only a URI reference to
the document data (not the document data itself).
- The Create-Job Request: A client that wants to submit a print
job with multiple documents uses the Create-Job operation. This
operation is followed by an arbitrary number (one or more) of
Send-Document and/or Send-URI operations (each creating another
document for the newly create Job object). The Send-Document
operation includes the document data in the request (the client
"pushes" the document data to the printer), and the Send-URI
operation includes only a URI reference to the document data in
the request (the Printer "pulls" the document data from the
referenced location). The last Send-Document or Send-URI
request for a given Job object includes a "last-document"
operation attribute set to 'true' indicating that this is the
last request.
Throughout this model document, the term "create request" is used to
refer to any of these three operation requests.
Hastings, et al. Standards Track [Page 38]
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A Create-Job operation followed by only one Send-Document operation
is semantically equivalent to a Print-Job operation, however, for
performance reasons, the client SHOULD use the Print-Job operation
for all single document jobs. Also, Print-Job is a REQUIRED
operation (all implementations MUST support it) whereas Create-Job is
an OPTIONAL operation, hence some implementations might not support
it.
Job submission time is the point in time when a client issues a
create request. The initial state of every Job object is the
'pending', 'pending-held', or 'processing' state (see section 4.3.7).
When the Printer object begins processing the print job, the Job
object's state moves to 'processing'. This is known as job
processing time. There are validation checks that must be done at
job submission time and others that must be performed at job
processing time.
At job submission time and at the time a Validate-Job operation is
received, the Printer MUST do the following:
1. Process the client supplied attributes and either accept or
reject the request
2. Validate the syntax of and support for the scheme of any client
supplied URI
At job submission time the Printer object MUST validate whether or
not the supplied attributes, attribute syntaxes, and values are
supported by matching them with the Printer object's corresponding
"xxx-supported" attributes. See section 3.1.7 for details. [IPP-
IIG] presents suggested steps for an IPP object to either accept or
reject any request and additional steps for processing create
requests.
At job submission time the Printer object NEED NOT perform the
validation checks reserved for job processing time such as:
1. Validating the document data
2. Validating the actual contents of any client supplied URI
(resolve the reference and follow the link to the document
data)
At job submission time, these additional job processing time
validation checks are essentially useless, since they require
actually parsing and interpreting the document data, are not
guaranteed to be 100% accurate, and MUST be done, yet again, at job
processing time. Also, in the case of a URI, checking for
availability at job submission time does not guarantee availability
Hastings, et al. Standards Track [Page 39]
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at job processing time. In addition, at job processing time, the
Printer object might discover any of the following conditions that
were not detectable at job submission time:
- runtime errors in the document data,
- nested document data that is in an unsupported format,
- the URI reference is no longer valid (i.e., the server hosting
the document might be down), or
- any other job processing error
At job submission time, a Printer object, especially a non-spooling
Printer, MAY accept jobs that it does not have enough space for. In
such a situation, a Printer object MAY stop reading data from a
client for an indefinite period of time. A client MUST be prepared
for a write operation to block for an indefinite period of time (see
section 5.1 on client conformance).
When a Printer object has too little space for starting a new job, it
MAY reject a new create request. In this case, a Printer object MUST
return a response (in reply to the rejected request) with a status-
code of 'server-error-busy' (see section 14.1.5.8) and it MAY close
the connection before receiving all bytes of the operation. A
Printer SHOULD indicate that it is temporarily unable to accept jobs
by setting the 'spool-space-full' value in its "printer-state-
reasons" attribute and removing the value when it can accept another
job (see section 4.4.12).
When receiving a 'server-error-busy' status-code in an operation
response, a client MUST be prepared for the Printer object to close
the connection before the client has sent all of the data (especially
for the Print-Job operation). A client MUST be prepared to keep
submitting a create request until the IPP Printer object accepts the
create request.
At job processing time, since the Printer object has already
responded with a successful status code in the response to the create
request, if the Printer object detects an error, the Printer object
is unable to inform the end user of the error with an operation
status code. In this case, the Printer, depending on the error, can
set the job object's "job-state", "job-state-reasons", or "job-
state-message" attributes to the appropriate value(s) so that later
queries can report the correct job status.
Note: Asynchronous notification of events is outside the scope of
this IPP/1.1 document.
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All Printer operations are directed at Printer objects. A client
MUST always supply the "printer-uri" operation attribute in order to
identify the correct target of the operation.
This REQUIRED operation allows a client to submit a print job with
only one document and supply the document data (rather than just a
reference to the data). See Section 15 for the suggested steps for
processing create operations and their Operation and Job Template
attributes.
The following groups of attributes are supplied as part of the
Print-Job Request:
Group 1: Operation Attributes
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.1. The Printer object
MUST copy these values to the corresponding Job Description
attributes described in sections 4.3.19 and 4.3.20.
Target:
The "printer-uri" (uri) operation attribute which is the target
for this operation as described in section 3.1.5.
Requesting User Name:
The "requesting-user-name" (name(MAX)) attribute SHOULD be
supplied by the client as described in section 8.3.
"job-name" (name(MAX)):
The client OPTIONALLY supplies this attribute. The Printer
object MUST support this attribute. It contains the client
supplied Job name. If this attribute is supplied by the
client, its value is used for the "job-name" attribute of the
newly created Job object. The client MAY automatically include
any information that will help the end-user distinguish amongst
his/her jobs, such as the name of the application program along
with information from the document, such as the document name,
document subject, or source file name. If this attribute is
not supplied by the client, the Printer generates a name to use
in the "job-name" attribute of the newly created Job object
(see Section 4.3.5).
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"ipp-attribute-fidelity" (boolean):
The client OPTIONALLY supplies this attribute. The Printer
object MUST support this attribute. The value 'true' indicates
that total fidelity to client supplied Job Template attributes
and values is required, else the Printer object MUST reject the
Print-Job request. The value 'false' indicates that a
reasonable attempt to print the Job object is acceptable and
the Printer object MUST accept the Print-Job request. If not
supplied, the Printer object assumes the value is 'false'. All
Printer objects MUST support both types of job processing. See
section 15 for a full description of "ipp-attribute-fidelity"
and its relationship to other attributes, especially the
Printer object's "pdl-override-supported" attribute.
"document-name" (name(MAX)):
The client OPTIONALLY supplies this attribute. The Printer
object MUST support this attribute. It contains the client
supplied document name. The document name MAY be different
than the Job name. Typically, the client software
automatically supplies the document name on behalf of the end
user by using a file name or an application generated name. If
this attribute is supplied, its value can be used in a manner
defined by each implementation. Examples include: printed
along with the Job (job start sheet, page adornments, etc.),
used by accounting or resource tracking management tools, or
even stored along with the document as a document level
attribute. IPP/1.1 does not support the concept of document
level attributes.
"compression" (type3 keyword):
The client OPTIONALLY supplies this attribute. The Printer
object MUST support this attribute and the "compression-
supported" attribute (see section 4.4.32). The client supplied
"compression" operation attribute identifies the compression
algorithm used on the document data. The following cases exist:
a) If the client omits this attribute, the Printer object MUST
assume that the data is not compressed (i.e. the Printer
follows the rules below as if the client supplied the
"compression" attribute with a value of 'none').
b) If the client supplies this attribute, but the value is not
supported by the Printer object, i.e., the value is not one
of the values of the Printer object's "compression-
supported" attribute, the Printer object MUST reject the
request, and return the 'client-error-compression-not-
supported' status code. See section 3.1.7 for returning
unsupported attributes and values.
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c) If the client supplies the attribute and the Printer object
supports the attribute value, the Printer object uses the
corresponding decompression algorithm on the document data.
d) If the decompression algorithm fails before the Printer
returns an operation response, the Printer object MUST
reject the request and return the 'client-error-
compression-error' status code.
e) If the decompression algorithm fails after the Printer
returns an operation response, the Printer object MUST abort
the job and add the 'compression-error' value to the job's
"job-state-reasons" attribute.
f) If the decompression algorithm succeeds, the document data
MUST then have the format specified by the job's "document-
format" attribute, if supplied (see "document-format"
operation attribute definition below).
"document-format" (mimeMediaType):
The client OPTIONALLY supplies this attribute. The Printer
object MUST support this attribute. The value of this
attribute identifies the format of the supplied document data.
The following cases exist:
a) If the client does not supply this attribute, the Printer
object assumes that the document data is in the format
defined by the Printer object's "document-format-default"
attribute. (i.e. the Printer follows the rules below as if
the client supplied the "document-format" attribute with a
value equal to the printer's default value).
b) If the client supplies this attribute, but the value is not
supported by the Printer object, i.e., the value is not one
of the values of the Printer object's "document-format-
supported" attribute, the Printer object MUST reject the
request and return the 'client-error-document-format-not-
supported' status code.
c) If the client supplies this attribute and its value is
'application/octet-stream' (i.e. to be auto-sensed, see
Section 4.1.9.1), and the format is not one of the
document-formats that the Printer can auto-sense, and this
check occurs before the Printer returns an operation
response, then the Printer MUST reject the request and
return the 'client-error-document-format-not-supported'
status code.
d) If the client supplies this attribute, and the value is
supported by the Printer object, the Printer is capable of
interpreting the document data.
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e) If interpreting of the document data fails before the
Printer returns an operation response, the Printer object
MUST reject the request and return the 'client-error-
document-format-error' status code.
f) If interpreting of the document data fails after the Printer
returns an operation response, the Printer object MUST abort
the job and add the 'document-format-error' value to the
job's "job-state-reasons" attribute.
"document-natural-language" (naturalLanguage):
The client OPTIONALLY supplies this attribute. The Printer
object OPTIONALLY supports this attribute. This attribute
specifies the natural language of the document for those
document-formats that require a specification of the natural
language in order to image the document unambiguously. There
are no particular values required for the Printer object to
support.
"job-k-octets" (integer(0:MAX)):
The client OPTIONALLY supplies this attribute. The Printer
object OPTIONALLY supports this attribute and the "job-k-
octets-supported" attribute (see section 4.4.33). The client
supplied "job-k-octets" operation attribute identifies the
total size of the document(s) in K octets being submitted (see
section 4.3.17.1 for the complete semantics). If the client
supplies the attribute and the Printer object supports the
attribute, the value of the attribute is used to populate the
Job object's "job-k-octets" Job Description attribute.
For this attribute and the following two attributes ("job-
impressions", and "job-media-sheets"), if the client supplies
the attribute, but the Printer object does not support the
attribute, the Printer object ignores the client-supplied
value. If the client supplies the attribute and the Printer
supports the attribute, and the value is within the range of
the corresponding Printer object's "xxx-supported" attribute,
the Printer object MUST use the value to populate the Job
object's "xxx" attribute. If the client supplies the attribute
and the Printer supports the attribute, but the value is
outside the range of the corresponding Printer object's "xxx-
supported" attribute, the Printer object MUST copy the
attribute and its value to the Unsupported Attributes response
group, reject the request, and return the 'client-error-
attributes-or-values-not-supported' status code. If the client
does not supply the attribute, the Printer object MAY choose to
populate the corresponding Job object attribute depending on
whether the Printer object supports the attribute and is able
to calculate or discern the correct value.
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"job-impressions" (integer(0:MAX)):
The client OPTIONALLY supplies this attribute. The Printer
object OPTIONALLY supports this attribute and the "job-
impressions-supported" attribute (see section 4.4.34). The
client supplied "job-impressions" operation attribute
identifies the total size in number of impressions of the
document(s) being submitted (see section 4.3.17.2 for the
complete semantics).
See last paragraph under "job-k-octets".
"job-media-sheets" (integer(0:MAX)):
The client OPTIONALLY supplies this attribute. The Printer
object OPTIONALLY supports this attribute and the "job-media-
sheets-supported" attribute (see section 4.4.35). The client
supplied "job-media-sheets" operation attribute identifies the
total number of media sheets to be produced for this job (see
section 4.3.17.3 for the complete semantics).
See last paragraph under "job-k-octets".
Group 2: Job Template Attributes
The client OPTIONALLY supplies a set of Job Template attributes as
defined in section 4.2. If the client is not supplying any Job
Template attributes in the request, the client SHOULD omit Group 2
rather than sending an empty group. However, a Printer object
MUST be able to accept an empty group.
Group 3: Document Content
The client MUST supply the document data to be processed.
In addition to the MANDATORY parameters required for every
operation request, the simplest Print-Job Request consists of just
the "attributes-charset" and "attributes-natural-language"
operation attributes; the "printer-uri" target operation
attribute; the Document Content and nothing else. In this simple
case, the Printer object:
- creates a new Job object (the Job object contains a single
document),
- stores a generated Job name in the "job-name" attribute in the
natural language and charset requested (see Section 3.1.4.1) (if
those are supported, otherwise using the Printer object's
default natural language and charset), and
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- at job processing time, uses its corresponding default value
attributes for the supported Job Template attributes that were
not supplied by the client as IPP attribute or embedded
instructions in the document data.
The Printer object MUST return to the client the following sets of
attributes as part of the Print-Job Response:
Group 1: Operation Attributes
Status Message:
In addition to the REQUIRED status code returned in every
response, the response OPTIONALLY includes a "status-message"
(text(255)) and/or a "detailed-status-message" (text(MAX))
operation attribute as described in sections 13 and 3.1.6. If
the client supplies unsupported or conflicting Job Template
attributes or values, the Printer object MUST reject or accept
the Print-Job request depending on the whether the client
supplied a 'true' or 'false' value for the "ipp-attribute-
fidelity" operation attribute. See the Implementer's Guide
[IPP-IIG] for a complete description of the suggested steps for
processing a create request.
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.2.
Group 2: Unsupported Attributes
See section 3.1.7 for details on returning Unsupported Attributes.
The value of the "ipp-attribute-fidelity" supplied by the client
does not affect what attributes the Printer object returns in this
group. The value of "ipp-attribute-fidelity" only affects whether
the Print-Job operation is accepted or rejected. If the job is
accepted, the client may query the job using the Get-Job-
Attributes operation requesting the unsupported attributes that
were returned in the create response to see which attributes were
ignored (not stored on the Job object) and which attributes were
stored with other (substituted) values.
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RFC 2911 IPP/1.1: Model and Semantics September 2000
Group 3: Job Object Attributes
"job-uri" (uri):
The Printer object MUST return the Job object's URI by
returning the contents of the REQUIRED "job-uri" Job object
attribute. The client uses the Job object's URI when directing
operations at the Job object. The Printer object always uses
its configured security policy when creating the new URI.
However, if the Printer object supports more than one URI, the
Printer object also uses information about which URI was used
in the Print-Job Request to generated the new URI so that the
new URI references the correct access channel. In other words,
if the Print-Job Request comes in over a secure channel, the
Printer object MUST generate a Job URI that uses the secure
channel as well.
"job-id" (integer(1:MAX)):
The Printer object MUST return the Job object's Job ID by
returning the REQUIRED "job-id" Job object attribute. The
client uses this "job-id" attribute in conjunction with the
"printer-uri" attribute used in the Print-Job Request when
directing Job operations at the Printer object.
"job-state" (type1 enum):
The Printer object MUST return the Job object's REQUIRED "job-
state" attribute. The value of this attribute (along with the
value of the next attribute: "job-state-reasons") is taken
from a "snapshot" of the new Job object at some meaningful
point in time (implementation defined) between when the Printer
object receives the Print-Job Request and when the Printer
object returns the response.
"job-state-reasons" (1setOf type2 keyword):
The Printer object MUST return the Job object's REQUIRED "job-
state-reasons" attribute.
"job-state-message" (text(MAX)):
The Printer object OPTIONALLY returns the Job object's OPTIONAL
"job-state-message" attribute. If the Printer object supports
this attribute then it MUST be returned in the response. If
this attribute is not returned in the response, the client can
assume that the "job-state-message" attribute is not supported
and will not be returned in a subsequent Job object query.
"number-of-intervening-jobs" (integer(0:MAX)):
The Printer object OPTIONALLY returns the Job object's OPTIONAL
"number-of-intervening-jobs" attribute. If the Printer object
supports this attribute then it MUST be returned in the
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response. If this attribute is not returned in the response,
the client can assume that the "number-of-intervening-jobs"
attribute is not supported and will not be returned in a
subsequent Job object query.
Note: Since any printer state information which affects a job's
state is reflected in the "job-state" and "job-state-reasons"
attributes, it is sufficient to return only these attributes
and no specific printer status attributes.
Note: In addition to the MANDATORY parameters required for every
operation response, the simplest response consists of the just the
"attributes-charset" and "attributes-natural-language" operation
attributes and the "job-uri", "job-id", and "job-state" Job Object
Attributes. In this simplest case, the status code is 'successful-
ok' and there is no "status-message" or "detailed-status-message"
operation attribute.
This OPTIONAL operation is identical to the Print-Job operation
(section 3.2.1) except that a client supplies a URI reference to the
document data using the "document-uri" (uri) operation attribute (in
Group 1) rather than including the document data itself. Before
returning the response, the Printer MUST validate that the Printer
supports the retrieval method (e.g., http, ftp, etc.) implied by the
URI, and MUST check for valid URI syntax. If the client-supplied URI
scheme is not supported, i.e. the value is not in the Printer
object's "referenced-uri-scheme-supported" attribute, the Printer
object MUST reject the request and return the 'client-error-uri-
scheme-not-supported' status code.
The IPP Printer MAY validate the accessibility of the document as
part of the operation or subsequently. If the Printer determines an
accessibility problem before returning an operation response, it
rejects the request and returns the 'client-error-document-access-
error' status code. The Printer MAY also return a specific document
access error code using the "document-access-error" operation
attribute (see section 3.1.6.4).
If the Printer determines this document accessibility problem after
accepting the request and returning an operation response with one of
the successful status codes, the Printer adds the 'document-access-
error' value to the job's "job-state-reasons" attribute and MAY
populate the job's "job-document-access-errors" Job Description
attribute (see section 4.3.11). See The Implementer's Guide [IPP-
IIG] for suggested additional checks.
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If the Printer object supports this operation, it MUST support the
"reference-uri-schemes-supported" Printer attribute (see section
4.4.27).
It is up to the IPP object to interpret the URI and subsequently
"pull" the document from the source referenced by the URI string.
This REQUIRED operation is similar to the Print-Job operation
(section 3.2.1) except that a client supplies no document data and
the Printer allocates no resources (i.e., it does not create a new
Job object). This operation is used only to verify capabilities of a
printer object against whatever attributes are supplied by the client
in the Validate-Job request. By using the Validate-Job operation a
client can validate that an identical Print-Job operation (with the
document data) would be accepted. The Validate-Job operation also
performs the same security negotiation as the Print-Job operation
(see section 8), so that a client can check that the client and
Printer object security requirements can be met before performing a
Print-Job operation.
The Validate-Job operation does not accept a "document-uri" attribute
in order to allow a client to check that the same Print-URI operation
will be accepted, since the client doesn't send the data with the
Print-URI operation. The client SHOULD just issue the Print-URI
request.
The Printer object returns the same status codes, Operation
Attributes (Group 1) and Unsupported Attributes (Group 2) as the
Print-Job operation. However, no Job Object Attributes (Group 3) are
returned, since no Job object is created.
This OPTIONAL operation is similar to the Print-Job operation
(section 3.2.1) except that in the Create-Job request, a client does
not supply document data or any reference to document data. Also,
the client does not supply any of the "document-name", "document-
format", "compression", or "document-natural-language" operation
attributes. This operation is followed by one or more Send-Document
or Send-URI operations. In each of those operation requests, the
client OPTIONALLY supplies the "document-name", "document-format",
and "document-natural-language" attributes for each document in the
multi-document Job object.
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If a Printer object supports the Create-Job operation, it MUST also
support the Send-Document operation and also MAY support the Send-URI
operation.
If the Printer object supports this operation, it MUST support the
"multiple-operation-time-out" Printer attribute (see section 4.4.31).
If the Printer object supports this operation, then it MUST support
the "multiple-document-jobs-supported" Printer Description attribute
(see section 4.4.16) and indicate whether or not it supports
multiple-document jobs.
If the Printer object supports this operation and supports multiple
documents in a job, then it MUST support the "multiple-document-
handling" Job Template job attribute with at least one value (see
section 4.2.4) and the associated "multiple-document-handling-
default" and "multiple-document-handling-supported" Job Template
Printer attributes (see section 4.2).
After the Create-Job operation has completed, the value of the "job-
state" attribute is similar to the "job-state" after a Print-Job,
even though no document-data has arrived. A Printer MAY set the
'job-data-insufficient' value of the job's "job-state-reason"
attribute to indicate that processing cannot begin until sufficient
data has arrived and set the "job-state" to either 'pending' or
'pending-held'. A non-spooling printer that doesn't implement the
'pending' job state may even set the "job-state" to 'processing',
even though there is not yet any data to process. See sections 4.3.7
and 4.3.8.
This REQUIRED operation allows a client to request the values of the
attributes of a Printer object. In the request, the client supplies
the set of Printer attribute names and/or attribute group names in
which the requester is interested. In the response, the Printer
object returns a corresponding attribute set with the appropriate
attribute values filled in.
For Printer objects, the possible names of attribute groups are:
- 'job-template': the subset of the Job Template attributes that
apply to a Printer object (the last two columns of the table in
Section 4.2) that the implementation supports for Printer
objects.
- 'printer-description': the subset of the attributes specified in
Section 4.4 that the implementation supports for Printer
objects.
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- 'all': the special group 'all' that includes all attributes that
the implementation supports for Printer objects.
Since a client MAY request specific attributes or named groups, there
is a potential that there is some overlap. For example, if a client
requests, 'printer-name' and 'all', the client is actually requesting
the "printer-name" attribute twice: once by naming it explicitly, and
once by inclusion in the 'all' group. In such cases, the Printer
object NEED NOT return each attribute only once in the response even
if it is requested multiple times. The client SHOULD NOT request the
same attribute in multiple ways.
It is NOT REQUIRED that a Printer object support all attributes
belonging to a group (since some attributes are OPTIONAL). However,
it is REQUIRED that each Printer object support all group names.
The following sets of attributes are part of the Get-Printer-
Attributes Request:
Group 1: Operation Attributes
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.1.
Target:
The "printer-uri" (uri) operation attribute which is the target
for this operation as described in section 3.1.5.
Requesting User Name:
The "requesting-user-name" (name(MAX)) attribute SHOULD be
supplied by the client as described in section 8.3.
"requested-attributes" (1setOf keyword):
The client OPTIONALLY supplies a set of attribute names and/or
attribute group names in whose values the requester is
interested. The Printer object MUST support this attribute.
If the client omits this attribute, the Printer MUST respond as
if this attribute had been supplied with a value of 'all'.
"document-format" (mimeMediaType):
The client OPTIONALLY supplies this attribute. The Printer
object MUST support this attribute. This attribute is useful
for a Printer object to determine the set of supported
attribute values that relate to the requested document format.
The Printer object MUST return the attributes and values that
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it uses to validate a job on a create or Validate-Job operation
in which this document format is supplied. The Printer object
SHOULD return only (1) those attributes that are supported for
the specified format and (2) the attribute values that are
supported for the specified document format. By specifying the
document format, the client can get the Printer object to
eliminate the attributes and values that are not supported for
a specific document format. For example, a Printer object
might have multiple interpreters to support both
'application/postscript' (for PostScript) and 'text/plain' (for
text) documents. However, for only one of those interpreters
might the Printer object be able to support "number-up" with
values of '1', '2', and '4'. For the other interpreter it
might be able to only support "number-up" with a value of '1'.
Thus a client can use the Get-Printer-Attributes operation to
obtain the attributes and values that will be used to
accept/reject a create job operation.
If the Printer object does not distinguish between different
sets of supported values for each different document format
when validating jobs in the create and Validate-Job operations,
it MUST NOT distinguish between different document formats in
the Get-Printer-Attributes operation. If the Printer object
does distinguish between different sets of supported values for
each different document format specified by the client, this
specialization applies only to the following Printer object
attributes:
- Printer attributes that are Job Template attributes ("xxx-
default" "xxx-supported", and "xxx-ready" in the Table in
Section 4.2),
- "pdl-override-supported",
- "compression-supported",
- "job-k-octets-supported",
- "job-impressions-supported",
- "job-media-sheets-supported",
- "printer-driver-installer",
- "color-supported", and
- "reference-uri-schemes-supported"
The values of all other Printer object attributes (including
"document-format-supported") remain invariant with respect to the
client supplied document format (except for new Printer
description attribute as registered according to section 6.2).
If the client omits this "document-format" operation attribute,
the Printer object MUST respond as if the attribute had been
supplied with the value of the Printer object's "document-format-
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default" attribute. It is RECOMMENDED that the client always
supply a value for "document-format", since the Printer object's
"document-format-default" may be 'application/octet-stream', in
which case the returned attributes and values are for the union of
the document formats that the Printer can automatically sense.
For more details, see the description of the 'mimeMediaType'
attribute syntax in section 4.1.9.
If the client supplies a value for the "document-format" Operation
attribute that is not supported by the Printer, i.e., is not among
the values of the Printer object's "document-format-supported"
attribute, the Printer object MUST reject the operation and return
the 'client-error-document-format-not-supported' status code.
The Printer object returns the following sets of attributes as part
of the Get-Printer-Attributes Response:
Group 1: Operation Attributes
Status Message:
In addition to the REQUIRED status code returned in every
response, the response OPTIONALLY includes a "status-message"
(text(255)) and/or a "detailed-status-message" (text(MAX))
operation attribute as described in sections 13 and 3.1.6.
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.2.
Group 2: Unsupported Attributes
See section 3.1.7 for details on returning Unsupported Attributes.
The response NEED NOT contain the "requested-attributes" operation
attribute with any supplied values (attribute keywords) that were
requested by the client but are not supported by the IPP object.
If the Printer object does return unsupported attributes
referenced in the "requested-attributes" operation attribute and
that attribute included group names, such as 'all', the
unsupported attributes MUST NOT include attributes described in
the standard but not supported by the implementation.
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Group 3: Printer Object Attributes
This is the set of requested attributes and their current values.
The Printer object ignores (does not respond with) any requested
attribute which is not supported. The Printer object MAY respond
with a subset of the supported attributes and values, depending on
the security policy in force. However, the Printer object MUST
respond with the 'unknown' value for any supported attribute
(including all REQUIRED attributes) for which the Printer object
does not know the value. Also the Printer object MUST respond
with the 'no-value' for any supported attribute (including all
REQUIRED attributes) for which the system administrator has not
configured a value. See the description of the "out-of-band"
values in the beginning of Section 4.1.
This REQUIRED operation allows a client to retrieve the list of Job
objects belonging to the target Printer object. The client may also
supply a list of Job attribute names and/or attribute group names. A
group of Job object attributes will be returned for each Job object
that is returned.
This operation is similar to the Get-Job-Attributes operation, except
that this Get-Jobs operation returns attributes from possibly more
than one object.
The client submits the Get-Jobs request to a Printer object.
The following groups of attributes are part of the Get-Jobs Request:
Group 1: Operation Attributes
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.1.
Target:
The "printer-uri" (uri) operation attribute which is the target
for this operation as described in section 3.1.5.
Requesting User Name:
The "requesting-user-name" (name(MAX)) attribute SHOULD be
supplied by the client as described in section 8.3.
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"limit" (integer(1:MAX)):
The client OPTIONALLY supplies this attribute. The Printer
object MUST support this attribute. It is an integer value that
determines the maximum number of jobs that a client will
receive from the Printer even if "which-jobs" or "my-jobs"
constrain which jobs are returned. The limit is a "stateless
limit" in that if the value supplied by the client is 'N', then
only the first 'N' jobs are returned in the Get-Jobs Response.
There is no mechanism to allow for the next 'M' jobs after the
first 'N' jobs. If the client does not supply this attribute,
the Printer object responds with all applicable jobs.
"requested-attributes" (1setOf type2 keyword):
The client OPTIONALLY supplies this attribute. The Printer
object MUST support this attribute. It is a set of Job
attribute names and/or attribute groups names in whose values
the requester is interested. This set of attributes is
returned for each Job object that is returned. The allowed
attribute group names are the same as those defined in the
Get-Job-Attributes operation in section 3.3.4. If the client
does not supply this attribute, the Printer MUST respond as if
the client had supplied this attribute with two values: 'job-
uri' and 'job-id'.
"which-jobs" (type2 keyword):
The client OPTIONALLY supplies this attribute. The Printer
object MUST support this attribute. It indicates which Job
objects MUST be returned by the Printer object. The values for
this attribute are:
'completed': This includes any Job object whose state is
'completed', 'canceled', or 'aborted'.
'not-completed': This includes any Job object whose state is
'pending', 'processing', 'processing-stopped', or 'pending-
held'.
A Printer object MUST support both values. However, if the
implementation does not keep jobs in the 'completed',
'canceled', and 'aborted' states, then it returns no jobs when
the 'completed' value is supplied.
If a client supplies some other value, the Printer object MUST
copy the attribute and the unsupported value to the Unsupported
Attributes response group, reject the request, and return the
'client-error-attributes-or-values-not-supported' status code.
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If the client does not supply this attribute, the Printer
object MUST respond as if the client had supplied the attribute
with a value of 'not-completed'.
"my-jobs" (boolean):
The client OPTIONALLY supplies this attribute. The Printer
object MUST support this attribute. It indicates whether jobs
from all users or just the jobs submitted by the requesting
user of this request MUST be considered as candidate jobs to be
returned by the Printer object. If the client does not supply
this attribute, the Printer object MUST respond as if the
client had supplied the attribute with a value of 'false',
i.e., jobs from all users. The means for authenticating the
requesting user and matching the jobs is described in section
8.
The Printer object returns all of the Job objects up to the number
specified by the "limit" attribute that match the criteria as defined
by the attribute values supplied by the client in the request. It is
possible that no Job objects are returned since there may literally
be no Job objects at the Printer, or there may be no Job objects that
match the criteria supplied by the client. If the client requests
any Job attributes at all, there is a set of Job Object Attributes
returned for each Job object.
It is not an error for the Printer to return 0 jobs. If the response
returns 0 jobs because there are no jobs matching the criteria, and
the request would have returned 1 or more jobs with a status code of
'successful-ok' if there had been jobs matching the criteria, then
the status code for 0 jobs MUST be 'successful-ok'.
Group 1: Operation Attributes
Status Message:
In addition to the REQUIRED status code returned in every
response, the response OPTIONALLY includes a "status-message"
(text(255)) and/or a "detailed-status-message" (text(MAX))
operation attribute as described in sections 13 and 3.1.6.
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.2.
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Group 2: Unsupported Attributes
See section 3.1.7 for details on returning Unsupported Attributes.
The response NEED NOT contain the "requested-attributes" operation
attribute with any supplied values (attribute keywords) that were
requested by the client but are not supported by the IPP object.
If the Printer object does return unsupported attributes
referenced in the "requested-attributes" operation attribute and
that attribute included group names, such as 'all', the
unsupported attributes MUST NOT include attributes described in
the standard but not supported by the implementation.
Groups 3 to N: Job Object Attributes
The Printer object responds with one set of Job Object Attributes
for each returned Job object. The Printer object ignores (does
not respond with) any requested attribute or value which is not
supported or which is restricted by the security policy in force,
including whether the requesting user is the user that submitted
the job (job originating user) or not (see section 8). However,
the Printer object MUST respond with the 'unknown' value for any
supported attribute (including all REQUIRED attributes) for which
the Printer object does not know the value, unless it would
violate the security policy. See the description of the "out-of-
band" values in the beginning of Section 4.1.
Jobs are returned in the following order:
- If the client requests all 'completed' Jobs (Jobs in the
'completed', 'aborted', or 'canceled' states), then the Jobs are
returned newest to oldest (with respect to actual completion
time)
- If the client requests all 'not-completed' Jobs (Jobs in the
'pending', 'processing', 'pending-held', and 'processing-
stopped' states), then Jobs are returned in relative
chronological order of expected time to complete (based on
whatever scheduling algorithm is configured for the Printer
object).
This OPTIONAL operation allows a client to stop the Printer object
from scheduling jobs on all its devices. Depending on
implementation, the Pause-Printer operation MAY also stop the Printer
from processing the current job or jobs. Any job that is currently
being printed is either stopped as soon as the implementation permits
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or is completed, depending on implementation. The Printer object
MUST still accept create operations to create new jobs, but MUST
prevent any jobs from entering the 'processing' state.
If the Pause-Printer operation is supported, then the Resume-Printer
operation MUST be supported, and vice-versa.
The IPP Printer stops the current job(s) on its device(s) that were
in the 'processing' or 'processing-stopped' states as soon as the
implementation permits. If the implementation will take appreciable
time to stop, the IPP Printer adds the 'moving-to-paused' value to
the Printer object's "printer-state-reasons" attribute (see section
4.4.12). When the device(s) have all stopped, the IPP Printer
transitions the Printer object to the 'stopped' state, removes the
'moving-to-paused' value, if present, and adds the 'paused' value to
the Printer object's "printer-state-reasons" attribute.
When the current job(s) complete that were in the 'processing' state,
the IPP Printer transitions them to the 'completed' state. When the
current job(s) stop in mid processing that were in the 'processing'
state, the IPP Printer transitions them to the 'processing-stopped'
state and adds the 'printer-stopped' value to the job's "job-state-
reasons" attribute.
For any jobs that are 'pending' or 'pending-held', the 'printer-
stopped' value of the jobs' "job-state-reasons" attribute also
applies. However, the IPP Printer NEED NOT update those jobs' "job-
state-reasons" attributes and only need return the 'printer-stopped'
value when those jobs are queried (so-called "lazy evaluation").
Whether the Pause-Printer operation affects jobs that were submitted
to the device from other sources than the IPP Printer object in the
same way that the Pause-Printer operation affects jobs that were
submitted to the IPP Printer object using IPP, depends on
implementation, i.e., on whether the IPP protocol is being used as a
universal management protocol or just to manage IPP jobs,
respectively.
The IPP Printer MUST accept the request in any state and transition
the Printer to the indicated new "printer-state" before returning as
follows:
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Current New "printer IPP Printer's response status
"printer- "printer- -state- code and action:
state" state" reasons"
'idle' 'stopped' 'paused' 'successful-ok'
'processing' 'processing' 'moving- OPTION 1: 'successful-ok';
to- Later, when all output has
paused' stopped, the "printer-state"
becomes 'stopped', and the
'paused' value replaces the
'moving-to-paused' value in the
"printer-state-reasons"
attribute
'processing' 'stopped' 'paused' OPTION 2: 'successful-ok';
all device output stopped
immediately
'stopped' 'stopped' 'paused' 'successful-ok'
Access Rights: The authenticated user (see section 8.3) performing
this operation must be an operator or administrator of the Printer
object (see Sections 1 and 8.5). Otherwise, the IPP Printer MUST
reject the operation and return: 'client-error-forbidden', 'client-
error-not-authenticated', or 'client-error-not-authorized' as
appropriate.
The following groups of attributes are part of the Pause-Printer
Request:
Group 1: Operation Attributes
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.1.
Target:
The "printer-uri" (uri) operation attribute which is the target
for this operation as described in section 3.1.5.
Requesting User Name:
The "requesting-user-name" (name(MAX)) attribute SHOULD be
supplied by the client as described in section 8.3.
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The following groups of attributes are part of the Pause-Printer
Response:
Group 1: Operation Attributes
Status Message:
In addition to the REQUIRED status code returned in every
response, the response OPTIONALLY includes a "status-message"
(text(255)) and/or a "detailed-status-message" (text(MAX))
operation attribute as described in sections 13 and 3.1.6.
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.2.
Group 2: Unsupported Attributes
See section 3.1.7 for details on returning Unsupported Attributes.
This operation allows a client to resume the Printer object
scheduling jobs on all its devices. The Printer object MUST remove
the 'paused' and 'moving-to-paused' values from the Printer object's
"printer-state-reasons" attribute, if present. If there are no other
reasons to keep a device paused (such as media-jam), the IPP Printer
is free to transition itself to the 'processing' or 'idle' states,
depending on whether there are jobs to be processed or not,
respectively, and the device(s) resume processing jobs.
If the Pause-Printer operation is supported, then the Resume-Printer
operation MUST be supported, and vice-versa.
The IPP Printer removes the 'printer-stopped' value from any job's
"job-state-reasons" attributes contained in that Printer.
The IPP Printer MUST accept the request in any state, transition the
Printer object to the indicated new state as follows:
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Current New "printer- IPP Printer's response status code and
"printer- state" action:
state"
'idle' 'idle' 'successful-ok'
'processing' 'processing' 'successful-ok'
'stopped' 'processing' 'successful-ok';
when there are jobs to be processed
'stopped' 'idle' 'successful-ok';
when there are no jobs to be processed.
Access Rights: The authenticated user (see section 8.3) performing
this operation must be an operator or administrator of the Printer
object (see Sections 1 and 8.5). Otherwise, the IPP Printer MUST
reject the operation and return: 'client-error-forbidden', 'client-
error-not-authenticated', or 'client-error-not-authorized' as
appropriate.
The Resume-Printer Request and Resume-Printer Response have the same
attribute groups and attributes as the Pause-Printer operation (see
sections 3.2.7.1 and 3.2.7.2).
This OPTIONAL operation allows a client to remove all jobs from an
IPP Printer object, regardless of their job states, including jobs in
the Printer object's Job History (see Section 4.3.7.2). After a
Purge-Jobs operation has been performed, a Printer object MUST return
no jobs in subsequent Get-Job-Attributes and Get-Jobs responses
(until new jobs are submitted).
Whether the Purge-Jobs (and Get-Jobs) operation affects jobs that
were submitted to the device from other sources than the IPP Printer
object in the same way that the Purge-Jobs operation affects jobs
that were submitted to the IPP Printer object using IPP, depends on
implementation, i.e., on whether the IPP protocol is being used as a
universal management protocol or just to manage IPP jobs,
respectively.
Note: if an operator wants to cancel all jobs without clearing out
the Job History, the operator uses the Cancel-Job operation on each
job instead of using the Purge-Jobs operation.
The Printer object MUST accept this operation in any state and
transition the Printer object to the 'idle' state.
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Access Rights: The authenticated user (see section 8.3) performing
this operation must be an operator or administrator of the Printer
object (see Sections 1 and 8.5). Otherwise, the IPP object MUST
reject the operation and return: client-error-forbidden, client-
error-not-authenticated, and client-error-not-authorized as
appropriate.
The Purge-Jobs Request and Purge-Jobs Response have the same
attribute groups and attributes as the Pause-Printer operation (see
sections 3.2.7.1 and 3.2.7.2).
All Job operations are directed at Job objects. A client MUST always
supply some means of identifying the Job object in order to identify
the correct target of the operation. That job identification MAY
either be a single Job URI or a combination of a Printer URI with a
Job ID. The IPP object implementation MUST support both forms of
identification for every job.
This OPTIONAL operation allows a client to create a multi-document
Job object that is initially "empty" (contains no documents). In the
Create-Job response, the Printer object returns the Job object's URI
(the "job-uri" attribute) and the Job object's 32-bit identifier (the
"job-id" attribute). For each new document that the client desires
to add, the client uses a Send-Document operation. Each Send-
Document Request contains the entire stream of document data for one
document.
If the Printer supports this operation but does not support multiple
documents per job, the Printer MUST reject subsequent Send-Document
operations supplied with data and return the 'server-error-multiple-
document-jobs-not-supported'. However, the Printer MUST accept the
first document with a 'true' or 'false' value for the "last-document"
operation attribute (see below), so that clients MAY always submit
one document jobs with a 'false' value for "last-document" in the
first Send-Document and a 'true' for "last-document" in the second
Send-Document (with no data).
Since the Create-Job and the send operations (Send-Document or Send-
URI operations) that follow could occur over an arbitrarily long
period of time for a particular job, a client MUST send another send
operation within an IPP Printer defined minimum time interval after
the receipt of the previous request for the job. If a Printer object
supports the Create-Job and Send-Document operations, the Printer
object MUST support the "multiple-operation-time-out" attribute (see
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section 4.4.31). This attribute indicates the minimum number of
seconds the Printer object will wait for the next send operation
before taking some recovery action.
An IPP object MUST recover from an errant client that does not supply
a send operation, sometime after the minimum time interval specified
by the Printer object's "multiple-operation-time-out" attribute.
Such recovery MAY include any of the following or other recovery
actions:
1. Assume that the Job is an invalid job, start the process of
changing the job state to 'aborted', add the 'aborted-by-
system' value to the job's "job-state-reasons" attribute (see
section 4.3.8), and clean up all resources associated with the
Job. In this case, if another send operation is finally
received, the Printer responds with an "client-error-not-
possible" or "client-error-not-found" depending on whether or
not the Job object is still around when the send operation
finally arrives.
2. Assume that the last send operation received was in fact the
last document (as if the "last-document" flag had been set to
'true'), close the Job object, and proceed to process it (i.e.,
move the Job's state to 'pending').
3. Assume that the last send operation received was in fact the
last document, close the Job, but move it to the 'pending-held'
and add the 'submission-interrupted' value to the job's "job-
state-reasons" attribute (see section 4.3.8). This action
allows the user or an operator to determine whether to continue
processing the Job by moving it back to the 'pending' state
using the Release-Job operation (see section 3.3.6) or to
cancel the job using the Cancel-Job operation (see section
3.3.3).
Each implementation is free to decide the "best" action to take
depending on local policy, whether any documents have been added,
whether the implementation spools jobs or not, and/or any other
piece of information available to it. If the choice is to abort the
Job object, it is possible that the Job object may already have been
processed to the point that some media sheet pages have been printed.
Access Rights: The authenticated user (see section 8.3) performing
this operation must either be the job owner (as determined in the
Create-Job operation) or an operator or administrator of the Printer
object (see Sections 1 and 8.5). Otherwise, the IPP object MUST
reject the operation and return: 'client-error-forbidden', 'client-
error-not-authenticated', or 'client-error-not-authorized' as
appropriate.
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The following attribute sets are part of the Send-Document Request:
Group 1: Operation Attributes
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.1.
Target:
Either (1) the "printer-uri" (uri) plus "job-id"
(integer(1:MAX))or (2) the "job-uri" (uri) operation
attribute(s) which define the target for this operation as
described in section 3.1.5.
Requesting User Name:
The "requesting-user-name" (name(MAX)) attribute SHOULD be
supplied by the client as described in section 8.3.
"document-name" (name(MAX)):
The client OPTIONALLY supplies this attribute. The Printer
object MUST support this attribute. It contains the client
supplied document name. The document name MAY be different than
the Job name. It might be helpful, but NEED NOT be unique
across multiple documents in the same Job. Typically, the
client software automatically supplies the document name on
behalf of the end user by using a file name or an application
generated name. See the description of the "document-name"
operation attribute in the Print-Job Request (section 3.2.1.1)
for more information about this attribute.
"compression" (type3 keyword):
See the description of "compression" for the Print-Job operation
in Section 3.2.1.1.
"document-format" (mimeMediaType):
See the description of "document-format" for the Print-Job
operation in Section 3.2.1.1.
"document-natural-language" (naturalLanguage):
The client OPTIONALLY supplies this attribute. The Printer
object OPTIONALLY supports this attribute. This attribute
specifies the natural language of the document for those
document-formats that require a specification of the natural
language in order to image the document unambiguously. There
are no particular values required for the Printer object to
support.
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"last-document" (boolean):
The client MUST supply this attribute. The Printer object MUST
support this attribute. It is a boolean flag that is set to
'true' if this is the last document for the Job, 'false'
otherwise.
Group 2: Document Content
The client MUST supply the document data if the "last-document"
flag is set to 'false'. However, since a client might not know
that the previous document sent with a Send-Document (or Send-URI)
operation was the last document (i.e., the "last-document"
attribute was set to 'false'), it is legal to send a Send-Document
request with no document data where the "last-document" flag is
set to 'true'. Such a request MUST NOT increment the value of the
Job object's "number-of-documents" attribute, since no real
document was added to the job. It is not an error for a client to
submit a job with no actual document data, i.e., only a single
Create-Job and Send-Document request with a "last-document"
operation attribute set to 'true' with no document data.
The following sets of attributes are part of the Send-Document
Response:
Group 1: Operation Attributes
Status Message:
In addition to the REQUIRED status code returned in every
response, the response OPTIONALLY includes a "status-message"
(text(255)) and/or a "detailed-status-message" (text(MAX))
operation attribute as described in sections 13 and 3.1.6.
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.2.
Group 2: Unsupported Attributes
See section 3.1.7 for details on returning Unsupported Attributes.
Group 3: Job Object Attributes
This is the same set of attributes as described in the Print-Job
response (see section 3.2.1.2).
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This OPTIONAL operation is identical to the Send-Document operation
(see section 3.3.1) except that a client MUST supply a URI reference
("document-uri" operation attribute) rather than the document data
itself. If a Printer object supports this operation, clients can use
both Send-URI or Send-Document operations to add new documents to an
existing multi-document Job object. However, if a client needs to
indicate that the previous Send-URI or Send-Document was the last
document, the client MUST use the Send-Document operation with no
document data and the "last-document" flag set to 'true' (rather than
using a Send-URI operation with no "document-uri" operation
attribute).
If a Printer object supports this operation, it MUST also support the
Print-URI operation (see section 3.2.2).
The Printer object MUST validate the syntax and URI scheme of the
supplied URI before returning a response, just as in the Print-URI
operation. The IPP Printer MAY validate the accessibility of the
document as part of the operation or subsequently (see section
3.2.2).
This REQUIRED operation allows a client to cancel a Print Job from
the time the job is created up to the time it is completed, canceled,
or aborted. Since a Job might already be printing by the time a
Cancel-Job is received, some media sheet pages might be printed
before the job is actually terminated.
The IPP object MUST accept or reject the request based on the job's
current state and transition the job to the indicated new state as
follows:
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Current "job- New "job- IPP object's response status
state" state" code and action:
'pending' 'canceled' 'successful-ok'
'pending-held' 'canceled' 'successful-ok'
'processing' 'canceled' 'successful-ok'
'processing' 'processing' 'successful-ok' See Rule 1
'processing' 'processing' 'client-error-not-possible'
See Rule 2
'processing- 'canceled' 'successful-ok'
stopped'
'processing- 'processing- 'successful-ok' See Rule 1
stopped' stopped'
'processing- 'processing- 'client-error-not-possible'
stopped' stopped' See Rule 2
'completed' 'completed' 'client-error-not-possible'
'canceled' 'canceled' 'client-error-not-possible'
'aborted' 'aborted' 'client-error-not-possible'
Rule 1: If the implementation requires some measurable time to
cancel the job in the 'processing' or 'processing-stopped' job
states, the IPP object MUST add the 'processing-to-stop-point' value
to the job's "job-state-reasons" attribute and then transition the
job to the 'canceled' state when the processing ceases (see section
4.3.8).
Rule 2: If the Job object already has the 'processing-to-stop-point'
value in its "job-state-reasons" attribute, then the Printer object
MUST reject a Cancel-Job operation.
Access Rights: The authenticated user (see section 8.3) performing
this operation must either be the job owner or an operator or
administrator of the Printer object (see Sections 1 and 8.5).
Otherwise, the IPP object MUST reject the operation and return:
'client-error-forbidden', 'client-error-not-authenticated', or
'client-error-not-authorized' as appropriate.
The following groups of attributes are part of the Cancel-Job
Request:
Group 1: Operation Attributes
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.1.
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Target:
Either (1) the "printer-uri" (uri) plus "job-id"
(integer(1:MAX))or (2) the "job-uri" (uri) operation
attribute(s) which define the target for this operation as
described in section 3.1.5.
Requesting User Name:
The "requesting-user-name" (name(MAX)) attribute SHOULD be
supplied by the client as described in section 8.3.
"message" (text(127)):
The client OPTIONALLY supplies this attribute. The Printer
object OPTIONALLY supports this attribute. It is a message to
the operator. This "message" attribute is not the same as the
"job-message-from-operator" attribute. That attribute is used
to report a message from the operator to the end user that
queries that attribute. This "message" operation attribute is
used to send a message from the client to the operator along
with the operation request. It is an implementation decision
of how or where to display this message to the operator (if at
all).
The following sets of attributes are part of the Cancel-Job Response:
Group 1: Operation Attributes
Status Message:
In addition to the REQUIRED status code returned in every
response, the response OPTIONALLY includes a "status-message"
(text(255)) and/or a "detailed-status-message" (text(MAX))
operation attribute as described in sections 13 and 3.1.6.
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.2.
Group 2: Unsupported Attributes
See section 3.1.7 for details on returning Unsupported Attributes.
Once a successful response has been sent, the implementation
guarantees that the Job will eventually end up in the 'canceled'
state. Between the time of the Cancel-Job operation is accepted and
when the job enters the 'canceled' job-state (see section 4.3.7), the
"job-state-reasons" attribute SHOULD contain the 'processing-to-
stop-point'
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value which indicates to later queries that although the Job might
still be 'processing', it will eventually end up in the
'canceled' state, not the 'completed' state.
This REQUIRED operation allows a client to request the values of
attributes of a Job object and it is almost identical to the Get-
Printer-Attributes operation (see section 3.2.5). The only
differences are that the operation is directed at a Job object rather
than a Printer object, there is no "document-format" operation
attribute used when querying a Job object, and the returned attribute
group is a set of Job object attributes rather than a set of Printer
object attributes.
For Jobs, the possible names of attribute groups are:
- 'job-template': the subset of the Job Template attributes that
apply to a Job object (the first column of the table in Section
4.2) that the implementation supports for Job objects.
- 'job-description': the subset of the Job Description attributes
specified in Section 4.3 that the implementation supports for
Job objects.
- 'all': the special group 'all' that includes all attributes that
the implementation supports for Job objects.
Since a client MAY request specific attributes or named groups, there
is a potential that there is some overlap. For example, if a client
requests, 'job-name' and 'job-description', the client is actually
requesting the "job-name" attribute once by naming it explicitly, and
once by inclusion in the 'job-description' group. In such cases, the
Printer object NEED NOT return the attribute only once in the
response even if it is requested multiple times. The client SHOULD
NOT request the same attribute in multiple ways.
It is NOT REQUIRED that a Job object support all attributes belonging
to a group (since some attributes are OPTIONAL). However it is
REQUIRED that each Job object support all these group names.
The following groups of attributes are part of the Get-Job-Attributes
Request when the request is directed at a Job object:
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Group 1: Operation Attributes
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.1.
Target:
Either (1) the "printer-uri" (uri) plus "job-id"
(integer(1:MAX)) or (2) the "job-uri" (uri) operation
attribute(s) which define the target for this operation as
described in section 3.1.5.
Requesting User Name:
The "requesting-user-name" (name(MAX)) attribute SHOULD be
supplied by the client as described in section 8.3.
"requested-attributes" (1setOf keyword):
The client OPTIONALLY supplies this attribute. The IPP object
MUST support this attribute. It is a set of attribute names
and/or attribute group names in whose values the requester is
interested. If the client omits this attribute, the IPP object
MUST respond as if this attribute had been supplied with a value
of 'all'.
The Printer object returns the following sets of attributes as part
of the Get-Job-Attributes Response:
Group 1: Operation Attributes
Status Message:
In addition to the REQUIRED status code returned in every
response, the response OPTIONALLY includes a "status-message"
(text(255)) and/or a "detailed-status-message" (text(MAX))
operation attribute as described in sections 13 and 3.1.6.
Natural Language and Character Set:
The "attributes-charset" and "attributes-natural-language"
attributes as described in section 3.1.4.2. The "attributes-
natural-language" MAY be the natural language of the Job
object, rather than the one requested.
Group 2: Unsupported Attributes
See section 3.1.7 for details on returning Unsupported Attributes.
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The response NEED NOT contain the "requested-attributes" operation
attribute with any supplied values (attribute keywords) that were
requested by the client but are not supported by the IPP object.
If the Printer object does return unsupported attributes
referenced in the "requested-attributes" operation attribute and
that attribute included group names, such as 'all', the
unsupported attributes MUST NOT include attributes described in
the standard but not supported by the implementation.
Group 3: Job Object Attributes
This is the set of requested attributes and their current values.
The IPP object ignores (does not respond with) any requested
attribute or value which is not supported or which is restricted
by the security policy in force, including whether the requesting
user is the user that submitted the job (job originating user) or
not (see section 8). However, the IPP object MUST respond with
the 'unknown' value for any supported attribute (including all
REQUIRED attributes) for which the IPP object does not know the
value, unless it would violate the security policy. See the
description of the "out-of-band" values in the beginning of
Section 4.1.
This OPTIONAL operation allows a client to hold a pending job in the
queue so that it is not eligible for scheduling. If the Hold-Job
operation is supported, then the Release-Job operation MUST be
supported, and vice-versa. The OPTIONAL "job-hold-until" operation
attribute allows a client to specify whether to hold the job
indefinitely or until a specified time period, if supported.
The IPP object MUST accept or reject the request based on the job's
current state and transition the job to the indicated new state as
follows:
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Current "job- New "job-state" IPP object's response status
state" code and action:
'pending' 'pending-held' 'successful-ok' See Rule 1
'pending' 'pending' 'successful-ok' See Rule 2
'pending-held' 'pending-held' 'successful-ok' See Rule 1
'pending-held' 'pending' 'successful-ok' See Rule 2
'processing' 'processing' 'client-error-not-possible'
'processing- 'processing- 'client-error-not-possible'
stopped' stopped'
'completed' 'completed' 'client-error-not-possible'
'canceled' 'canceled' 'client-error-not-possible'
'aborted' 'aborted' 'client-error-not-possible'
Rule 1: If the implementation supports multiple reasons for a job to
be in the 'pending-held' state, the IPP object MUST add the 'job-
hold-until-specified' value to the job's "job-state-reasons"
attribute.
Rule 2: If the IPP object supports the "job-hold-until" operation
attribute, but the specified time period has already started (or is
the 'no-hold' value) and there are no other reasons to hold the job,
the IPP object MUST make the job be a candidate for processing
immediately (see Section 4.2.2) by putting the job in the 'pending'
state.
Note: In order to keep the Hold-Job operation simple, such a request
is rejected when the job is in the 'processing' or 'processing-
stopped' states. If an operation is needed to hold jobs while in
these states, it will be added as an additional operation, rather
than overloading the Hold-Job operation. Then it is clear to clients
by querying the Printer object's "operations-supported" (see Section
4.4.15) and the Job object's "job-state" (see Section 4.3.7)
attributes which operations are possible.
Access Rights: The authenticated user (see section 8.3) performing
this operation must either be the job owner or an operator or
administrator of the Printer object (see Sections 1 and 8.5).
Otherwise, the IPP object MUST reject the operation and return:
'client-error-forbidden', 'client-error-not-authenticated', or
'client-error-not-authorized' as appropriate.
The groups and operation attributes are the same as for a Cancel-Job
request (see section 3.3.3.1), with the addition of the following
Group 1 Operation attribute:
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"job-hold-until" (type3 keyword | name(MAX)):
The client OPTIONALLY supplies this Operation attribute. The
IPP object MUST support this operation attribute in a Hold-Job
request, if it supports the "job-hold-until" Job template
attribute in create operations. See section 4.2.2. The IPP
object SHOULD support the "job-hold-until" Job Template
attribute for use in job create operations with at least the
'indefinite' value, if it supports the Hold-Job operation.
Otherwise, a client cannot create a job and hold it immediately
(without picking some supported time period in the future).
If supplied and supported as specified in the Printer's "job-
hold-until-supported" attribute, the IPP object copies the
supplied operation attribute to the Job object, replacing the
job's previous "job-hold-until" attribute, if present, and
makes the job a candidate for scheduling during the supplied
named time period.
If supplied, but either the "job-hold-until" Operation
attribute itself or the value supplied is not supported, the
IPP object accepts the request, returns the unsupported
attribute or value in the Unsupported Attributes Group
according to section 3.1.7, returns the 'successful-ok-
ignored-or-substituted-attributes, and holds the job
indefinitely until a client performs a subsequent Release-Job
operation.
If the client (1) supplies a value that specifies a time period
that has already started or the 'no-hold' value (meaning don't
hold the job) and (2) the IPP object supports the "job-hold-
until" operation attribute and there are no other reasons to
hold the job, the IPP object MUST accept the operation and make
the job be a candidate for processing immediately (see Section
4.2.2).
If the client does not supply a "job-hold-until" Operation
attribute in the request, the IPP object MUST populate the job
object with a "job-hold-until" attribute with the 'indefinite'
value (if IPP object supports the "job-hold-until" attribute)
and hold the job indefinitely, until a client performs a
Release-Job operation.
The groups and attributes are the same as for a Cancel-Job response
(see section 3.3.3.2).
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This OPTIONAL operation allows a client to release a previously held
job so that it is again eligible for scheduling. If the Hold-Job
operation is supported, then the Release-Job operation MUST be
supported, and vice-versa.
This operation removes the "job-hold-until" job attribute, if
present, from the job object that had been supplied in the create or
most recent Hold-Job or Restart-Job operation and removes its effect
on the job. The IPP object MUST remove the 'job-hold-until-
specified' value from the job's "job-state-reasons" attribute, if
present. See section 4.3.8.
The IPP object MUST accept or reject the request based on the job's
current state and transition the job to the indicated new state as
follows:
Current "job- New "job-state" IPP object's response status
state" code and action:
'pending' 'pending' 'successful-ok'
No effect on the job.
'pending-held' 'pending-held' 'successful-ok' See Rule 1
'pending-held' 'pending' 'successful-ok'
'processing' 'processing' 'successful-ok'
No effect on the job.
'processing- 'processing- 'successful-ok'
stopped' stopped' No effect on the job.
'completed' 'completed' 'client-error-not-possible'
'canceled' 'canceled' 'client-error-not-possible'
'aborted' 'aborted' 'client-error-not-possible'
Rule 1: If there are other reasons to keep the job in the 'pending-
held' state, such as 'resources-are-not-ready', the job remains in
the 'pending-held' state. Thus the 'pending-held' state is not just
for jobs that have the 'job-hold-until' applied to them, but are for
any reason to keep the job from being a candidate for scheduling and
processing, such as 'resources-are-not-ready'. See the "job-hold-
until" attribute (section 4.2.2).
Access Rights: The authenticated user (see section 8.3) performing
this operation must either be the job owner or an operator or
administrator of the Printer object (see Sections 1 and 8.5).
Otherwise, the IPP object MUST reject the operation and return:
'client-error-forbidden', 'client-error-not-authenticated', or
'client-error-not-authorized' as appropriate.
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The Release-Job Request and Release-Job Response have the same
attribute groups and attributes as the Cancel-Job operation (see
section 3.3.3.1 and 3.3.3.2).
This OPTIONAL operation allows a client to restart a job that is
retained in the queue after processing has completed (see section
4.3.7.2).
The job is moved to the 'pending' or 'pending-held' job state and
restarts at the beginning on the same IPP Printer object with the
same attribute values. If any of the documents in the job were
passed by reference (Print-URI or Send-URI), the Printer MUST re-
fetch the data, since the semantics of Restart-Job are to repeat all
Job processing. The Job Description attributes that accumulate job
progress, such as "job-impressions-completed", "job-media-sheets-
completed", and "job-k-octets-processed", MUST be reset to 0 so that
they give an accurate record of the job from its restart point. The
job object MUST continue to use the same "job-uri" and "job-id"
attribute values.
Note: If in the future an operation is needed that does not reset
the job progress attributes, then a new operation will be defined
which makes a copy of the job, assigns a new "job-uri" and "job-id"
to the copy and resets the job progress attributes in the new copy
only.
The IPP object MUST accept or reject the request based on the job's
current state, transition the job to the indicated new state as
follows:
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Current "job- New "job-state" IPP object's response status
state" code and action:
'pending' 'pending' 'client-error-not-possible'
'pending-held' 'pending-held' 'client-error-not-possible'
'processing' 'processing' 'client-error-not-possible'
'processing- 'processing- 'client-error-not-possible'
stopped' stopped'
'completed' 'pending' or 'successful-ok' - job is started
'pending-held' over.
'completed' 'completed' 'client-error-not-possible' -
see Rule 1
'canceled' 'pending' or 'successful-ok' - job is started
'pending-held' over.
'canceled' 'canceled' 'client-error-not-possible' -
see Rule 1
'aborted' 'pending' or 'successful-ok' - job is started
'pending-held' over.
'aborted' 'aborted' 'client-error-not-possible' -
see Rule 1
Rule 1: If the Job Retention Period has expired for the job in this
state, then the IPP object rejects the operation. See section
4.3.7.2.
Note: In order to prevent a user from inadvertently restarting a job
in the middle, the Restart-Job request is rejected when the job is in
the 'processing' or 'processing-stopped' states. If in the future an
operation is needed to hold or restart jobs while in these states, it
will be added as an additional operation, rather than overloading the
Restart-Job operation, so that it is clear that the user intended
that the current job not be completed.
Access Rights: The authenticated user (see section 8.3) performing
this operation must either be the job owner or an operator or
administrator of the Printer object (see Sections 1 and 8.5).
Otherwise, the IPP object MUST reject the operation and return:
'client-error-forbidden', 'client-error-not-authenticated', or
'client-error-not-authorized' as appropriate.
The groups and attributes are the same as for a Cancel-Job request
(see section 3.3.3.1), with the addition of the following Group 1
Operation attribute:
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"job-hold-until" (type3 keyword | name(MAX)):
The client OPTIONALLY supplies this attribute. The IPP object
MUST support this Operation attribute in a Restart-Job request,
if it supports the "job-hold-until" Job Template attribute in
create operations. See section 4.2.2. Otherwise, the IPP
object NEED NOT support the "job-hold-until" Operation
attribute in a Restart-Job request.
If supplied and supported as specified in the Printer's "job-
hold-until-supported" attribute, the IPP object copies the
supplied Operation attribute to the Job object, replacing the
job's previous "job-hold-until" attribute, if present, and
makes the job a candidate for scheduling during the supplied
named time period. See section 4.2.2.
If supplied, but the value is not supported, the IPP object
accepts the request, returns the unsupported attribute or value
in the Unsupported Attributes Group according to section 3.1.7,
returns the 'successful-ok-ignored-or-substituted-attributes'
status code, and holds the job indefinitely until a client
performs a subsequent Release-Job operation.
If supplied, but the "job-hold-until" Operation attribute
itself is not supported, the IPP object accepts the request,
returns the unsupported attribute with the out-of-band
'unsupported' value in the Unsupported Attributes Group
according to section 3.1.7, returns the 'successful-ok-
ignored-or-substituted-attributes' status code, and restarts
the job, i.e., ignores the "job-hold-until" attribute.
If the client (1) supplies a value that specifies a time period
that has already started or the 'no-hold' value (meaning don't
hold the job) and (2) the IPP object supports the "job-hold-
until" operation attribute and there are no other reasons to
hold the job, the IPP object makes the job a candidate for
processing immediately (see Section 4.2.2).
If the client does not supply a "job-hold-until" operation
attribute in the request, the IPP object removes the "job-
hold-until" attribute, if present, from the job. If there are
no other reasons to hold the job, the Restart-Job operation
makes the job a candidate for processing immediately (see
Section 4.2.2).
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The groups and attributes are the same as for a Cancel-Job response
(see section 3.3.3.2).
Note: In the future an OPTIONAL Modify-Job or Set-Job-Attributes
operation may be specified that allows the client to modify other
attributes before releasing the restarted job.
This section describes the attributes with their corresponding
attribute syntaxes and values that are part of the IPP model. The
sections below show the objects and their associated attributes which
are included within the scope of this protocol. Many of these
attributes are derived from other relevant documents:
- Document Printing Application (DPA) [ISO10175]
- RFC 1759 Printer MIB [RFC1759]
Each attribute is uniquely identified in this document using a
"keyword" (see section 12.2.1) which is the name of the attribute.
The keyword is included in the section header describing that
attribute.
Note: Not only are keywords used to identify attributes, but one of
the attribute syntaxes described below is "keyword" so that some
attributes have keyword values. Therefore, these attributes are
defined as having an attribute syntax that is a set of keywords.
This section defines the basic attribute syntax types that all
clients and IPP objects MUST be able to accept in responses and
accept in requests, respectively. Each attribute description in
sections 3 and 4 includes the name of attribute syntax(es) in the
heading (in parentheses). A conforming implementation of an
attribute MUST include the semantics of the attribute syntax(es) so
identified. Section 6.3 describes how the protocol can be extended
with new attribute syntaxes.
The attribute syntaxes are specified in the following sub-sections,
where the sub-section heading is the keyword name of the attribute
syntax inside the single quotes. In operation requests and responses
each attribute value MUST be represented as one of the attribute
syntaxes specified in the sub-section heading for the attribute. In
addition, the value of an attribute in a response (but not in a
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request) MAY be one of the "out-of-band" values whose special
encoding rules are defined in the "Encoding and Transport" document
[RFC2910]. Standard "out-of-band" values are:
'unknown': The attribute is supported by the IPP object, but the
value is unknown to the IPP object for some reason.
'unsupported': The attribute is unsupported by the IPP object.
This value MUST be returned only as the value of an attribute
in the Unsupported Attributes Group.
'no-value': The attribute is supported by the Printer object, but
the administrator has not yet configured a value.
All attributes in a request MUST have one or more values as defined
in Sections 4.2 to 4.4. Thus clients MUST NOT supply attributes with
"out-of-band" values for operations defined in this document. All
attributes in a response MUST have one or more values as defined in
Sections 4.2 to 4.4 or a single "out-of-band" value.
Most attributes are defined to have a single attribute syntax.
However, a few attributes (e.g., "job-sheet", "media", "job-hold-
until") are defined to have several attribute syntaxes, depending on
the value. These multiple attribute syntaxes are separated by the
"|" character in the sub-section heading to indicate the choice.
Since each value MUST be tagged as to its attribute syntax in the
protocol, a single-valued attribute instance may have any one of its
attribute syntaxes and a multi-valued attribute instance may have a
mixture of its defined attribute syntaxes.
A text attribute is an attribute whose value is a sequence of zero or
more characters encoded in a maximum of 1023 ('MAX') octets. MAX is
the maximum length for each value of any text attribute. However, if
an attribute will always contain values whose maximum length is much
less than MAX, the definition of that attribute will include a
qualifier that defines the maximum length for values of that
attribute. For example: the "printer-location" attribute is
specified as "printer-location (text(127))". In this case, text
values for "printer-location" MUST NOT exceed 127 octets; if supplied
with a longer text string via some external interface (other than the
protocol), implementations are free to truncate to this shorter
length limitation.
In this document, all text attributes are defined using the 'text'
syntax. However, 'text' is used only for brevity; the formal
interpretation of 'text' is: 'textWithoutLanguage |
textWithLanguage'. That is, for any attribute defined in this
document using the 'text' attribute syntax, all IPP objects and
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clients MUST support both the 'textWithoutLanguage' and
'textWithLanguage' attribute syntaxes. However, in actual usage and
protocol execution, objects and clients accept and return only one of
the two syntax per attribute. The syntax 'text' never appears "on-
the-wire".
Both 'textWithoutLanguage' and 'textWithLanguage' are needed to
support the real world needs of interoperability between sites and
systems that use different natural languages as the basis for human
communication. Generally, one natural language applies to all text
attributes in a given request or response. The language is indicated
by the "attributes-natural-language" operation attribute defined in
section 3.1.4 or "attributes-natural-language" job attribute defined
in section 4.3.20, and there is no need to identify the natural
language for each text string on a value-by-value basis. In these
cases, the attribute syntax 'textWithoutLanguage' is used for text
attributes. In other cases, the client needs to supply or the
Printer object needs to return a text value in a natural language
that is different from the rest of the text values in the request or
response. In these cases, the client or Printer object uses the
attribute syntax 'textWithLanguage' for text attributes (this is the
Natural Language Override mechanism described in section 3.1.4).
The 'textWithoutLanguage' and 'textWithLanguage' attribute syntaxes
are described in more detail in the following sections.
The 'textWithoutLanguage' syntax indicates a value that is sequence
of zero or more characters encoded in a maximum of 1023 (MAX) octets.
Text strings are encoded using the rules of some charset. The
Printer object MUST support the UTF-8 charset [RFC2279] and MAY
support additional charsets to represent 'text' values, provided that
the charsets are registered with IANA [IANA-CS]. See Section 4.1.7
for the definition of the 'charset' attribute syntax, including
restricted semantics and examples of charsets.
The 'textWithLanguage' attribute syntax is a compound attribute
syntax consisting of two parts: a 'textWithoutLanguage' part encoded
in a maximum of 1023 (MAX) octets plus an additional
'naturalLanguage' (see section 4.1.8) part that overrides the natural
language in force. The 'naturalLanguage' part explicitly identifies
the natural language that applies to the text part of that value and
that value alone. For any give text attribute, the
'textWithoutLanguage' part is limited to the maximum length defined
for that 'text' attribute, and the 'naturalLanguage' part is always
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limited to 63 (additional) octets. Using the 'textWithLanguage'
attribute syntax rather than the normal 'textWithoutLanguage' syntax
is the so-called Natural Language Override mechanism and MUST be
supported by all IPP objects and clients.
If the attribute is multi-valued (1setOf text), then the
'textWithLanguage' attribute syntax MUST be used to explicitly
specify each attribute value whose natural language needs to be
overridden. Other values in a multi-valued 'text' attribute in a
request or a response revert to the natural language of the operation
attribute.
In a create request, the Printer object MUST accept and store with
the Job object any natural language in the "attributes-natural-
language" operation attribute, whether the Printer object supports
that natural language or not. Furthermore, the Printer object MUST
accept and store any 'textWithLanguage' attribute value, whether the
Printer object supports that natural language or not. These
requirements are independent of the value of the "ipp-attribute-
fidelity" operation attribute that the client MAY supply.
Example: If the client supplies the "attributes-natural-language"
operation attribute with the value: 'en' indicating English, but the
value of the "job-name" attribute is in French, the client MUST use
the 'textWithLanguage' attribute syntax with the following two
values:
'fr': Natural Language Override indicating French
'Rapport Mensuel': the job name in French
See the "Encoding and Transport" document [RFC2910] section 3.9 for
the encoding of the two parts and Appendix A for a detailed example
of the 'textWithLanguage' attribute syntax.
This syntax type is used for user-friendly strings, such as a Printer
name, that, for humans, are more meaningful than identifiers. Names
are never translated from one natural language to another. The
'name' attribute syntax is essentially the same as 'text', including
the REQUIRED support of UTF-8 except that the sequence of characters
is limited so that its encoded form MUST NOT exceed 255 (MAX) octets.
Also like 'text', 'name' is really an abbreviated notation for either
'nameWithoutLanguage' or 'nameWithLanguage'. That is, all IPP
objects and clients MUST support both the 'nameWithoutLanguage' and
'nameWithLanguage' attribute syntaxes. However, in actual usage and
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protocol execution, objects and clients accept and return only one of
the two syntax per attribute. The syntax 'name' never appears "on-
the-wire".
Only the 'text' and 'name' attribute syntaxes permit the Natural
Language Override mechanism.
Some attributes are defined as 'type3 keyword | name'. These
attributes support values that are either type3 keywords or names.
This dual-syntax mechanism enables a site administrator to extend
these attributes to legally include values that are locally defined
by the site administrator. Such names are not registered with IANA.
The 'nameWithLanguage' attribute syntax is a compound attribute
syntax consisting of two parts: a 'nameWithoutLanguage' part encoded
in a maximum of 1023 (MAX) octets plus an additional
'naturalLanguage' (see section 4.1.8) part that overrides the natural
language in force. The 'naturalLanguage' part explicitly identifies
the natural language that applies to that name value and that name
value alone. For any give text attribute, the 'textWithoutLanguage'
part is limited to the maximum length defined for that 'text'
attribute, and the 'naturalLanguage' part is always limited to 63
(additional) octets. Using the 'textWithLanguage' attribute syntax
rather than the normal 'textWithoutLanguage' syntax is the so-called
Natural Language Override mechanism and MUST be supported by all IPP
objects and clients.
The 'nameWithLanguage' attribute syntax behaves the same as the
'textWithLanguage' syntax. Using the 'textWithLanguage' attribute
syntax rather than the normal 'textWithoutLanguage' syntax is the
so-called Natural Language Override mechanism and MUST be supported
by all IPP objects and clients. If a name is in a language that is
different than the rest of the object or operation, then this
'nameWithLanguage' syntax is used rather than the generic
'nameWithoutLanguage' syntax.
If the attribute is multi-valued (1setOf text), then the
'nameWithLanguage' attribute syntax MUST be used to explicitly
specify each attribute value whose natural language needs to be
overridden.
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Other values in a multi-valued 'name' attribute in a request or a
response revert to the natural language of the operation attribute.
In a create request, the Printer object MUST accept and store with
the Job object any natural language in the "attributes-natural-
language" operation attribute, whether the Printer object supports
that natural language or not. Furthermore, the Printer object MUST
accept and store any 'nameWithLanguage' attribute value, whether the
Printer object supports that natural language or not. These
requirements are independent of the value of the "ipp-attribute-
fidelity" operation attribute that the client MAY supply.
Example: If the client supplies the "attributes-natural-language"
operation attribute with the value: 'en' indicating English, but the
"printer-name" attribute is in German, the client MUST use the
'nameWithLanguage' attribute syntax as follows:
'de': Natural Language Override indicating German
'Farbdrucker': the Printer name in German
See the "Encoding and Transport" document [RFC2910] section 3.9 for
the encoding of the two parts and Appendix A for a detailed example
of the 'nameWithLanguage' attribute syntax.
For purposes of matching two 'name' attribute values for equality,
such as in job validation (where a client-supplied value for
attribute "xxx" is checked to see if the value is among the values of
the Printer object's corresponding "xxx-supported" attribute), the
following match rules apply:
1. 'keyword' values never match 'name' values.
2. 'name' (nameWithoutLanguage and nameWithLanguage) values match
if (1) the name parts match and (2) the Associated Natural-
Language parts (see section 3.1.4.1) match. The matching rules
are:
a. the name parts match if the two names are identical
character by character, except it is RECOMMENDED that case
be ignored. For example: 'Ajax-letter-head-white' MUST
match 'Ajax-letter-head-white' and SHOULD match 'ajax-
letter-head-white' and 'AJAX-LETTER-HEAD-WHITE'.
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b. the Associated Natural-Language parts match if the shorter
of the two meets the syntactic requirements of RFC 1766
[RFC1766] and matches byte for byte with the longer. For
example, 'en' matches 'en', 'en-us' and 'en-gb', but matches
neither 'fr' nor 'e'.
The 'keyword' attribute syntax is a sequence of characters, length: 1
to 255, containing only the US-ASCII [ASCII] encoded values for
lowercase letters ("a" - "z"), digits ("0" - "9"), hyphen ("-"), dot
("."), and underscore ("_"). The first character MUST be a lowercase
letter. Furthermore, keywords MUST be in U.S. English.
This syntax type is used for enumerating semantic identifiers of
entities in the abstract protocol, i.e., entities identified in this
document. Keywords are used as attribute names or values of
attributes. Unlike 'text' and 'name' attribute values, 'keyword'
values MUST NOT use the Natural Language Override mechanism, since
they MUST always be US-ASCII and U.S. English.
Keywords are for use in the protocol. A user interface will likely
provide a mapping between protocol keywords and displayable user-
friendly words and phrases which are localized to the natural
language of the user. While the keywords specified in this document
MAY be displayed to users whose natural language is U.S. English,
they MAY be mapped to other U.S. English words for U.S. English
users, since the user interface is outside the scope of this
document.
In the definition for each attribute of this syntax type, the full
set of defined keyword values for that attribute are listed.
When a keyword is used to represent an attribute (its name), it MUST
be unique within the full scope of all IPP objects and attributes.
When a keyword is used to represent a value of an attribute, it MUST
be unique just within the scope of that attribute. That is, the same
keyword MUST NOT be used for two different values within the same
attribute to mean two different semantic ideas. However, the same
keyword MAY be used across two or more attributes, representing
different semantic ideas for each attribute. Section 6.1 describes
how the protocol can be extended with new keyword values. Examples
of attribute name keywords:
"job-name"
"attributes-charset"
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Note: This document uses "type1", "type2", and "type3" prefixes to
the "keyword" basic syntax to indicate different levels of review for
extensions (see section 6.1).
The 'enum' attribute syntax is an enumerated integer value that is in
the range from 1 to 2**31 - 1 (MAX). Each value has an associated
'keyword' name. In the definition for each attribute of this syntax
type, the full set of possible values for that attribute are listed.
This syntax type is used for attributes for which there are enum
values assigned by other standards, such as SNMP MIBs. A number of
attribute enum values in this document are also used for
corresponding attributes in other standards [RFC1759]. This syntax
type is not used for attributes to which the administrator may assign
values. Section 6.1 describes how the protocol can be extended with
new enum values.
Enum values are for use in the protocol. A user interface will
provide a mapping between protocol enum values and displayable user-
friendly words and phrases which are localized to the natural
language of the user. While the enum symbols specified in this
document MAY be displayed to users whose natural language is U.S.
English, they MAY be mapped to other U.S. English words for U.S.
English users, since the user interface is outside the scope of this
document.
Note: SNMP MIBs use '2' for 'unknown' which corresponds to the IPP
"out-of-band" value 'unknown'. See the description of the "out-of-
band" values at the beginning of Section 4.1. Therefore, attributes
of type 'enum' start at '3'.
Note: This document uses "type1", "type2", and "type3" prefixes to
the "enum" basic syntax to indicate different levels of review for
extensions (see section 6.1).
The 'uri' attribute syntax is any valid Uniform Resource Identifier
or URI [RFC2396]. Most often, URIs are simply Uniform Resource
Locators or URLs. The maximum length of URIs used as values of IPP
attributes is 1023 octets. Although most other IPP attribute syntax
types allow for only lower-cased values, this attribute syntax type
conforms to the case-sensitive and case-insensitive rules specified
in [RFC2396]. See also [IPP-IIG] for a discussion of case in URIs.
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The 'uriScheme' attribute syntax is a sequence of characters
representing a URI scheme according to RFC 2396 [RFC2396]. Though
RFC 2396 requires that the values be case-insensitive, IPP requires
all lower case values in IPP attributes to simplify comparing by IPP
clients and Printer objects.
Standard values for this syntax type are the following keywords:
'ipp': for IPP schemed URIs (e.g., "ipp:...")
'http': for HTTP schemed URIs (e.g., "http:...")
'https': for use with HTTPS schemed URIs (e.g., "https:...") (not
on IETF standards track)
'ftp': for FTP schemed URIs (e.g., "ftp:...")
'mailto': for SMTP schemed URIs (e.g., "mailto:...")
'file': for file schemed URIs (e.g., "file:...")
A Printer object MAY support any URI 'scheme' that has been
registered with IANA [IANA-MT]. The maximum length of URI 'scheme'
values used to represent IPP attribute values is 63 octets.
The 'charset' attribute syntax is a standard identifier for a
charset. A charset is a coded character set and encoding scheme.
Charsets are used for labeling certain document contents and 'text'
and 'name' attribute values. The syntax and semantics of this
attribute syntax are specified in RFC 2046 [RFC2046] and contained in
the IANA character-set Registry [IANA-CS] according to the IANA
procedures [RFC2278]. Though RFC 2046 requires that the values be
case-insensitive US-ASCII [ASCII], IPP requires all lower case values
in IPP attributes to simplify comparing by IPP clients and Printer
objects. When a character-set in the IANA registry has more than one
name (alias), the name labeled as "(preferred MIME name)", if
present, MUST be used.
The maximum length of 'charset' values used to represent IPP
attribute values is 63 octets.
Some examples are:
'utf-8': ISO 10646 Universal Multiple-Octet Coded Character Set
(UCS) represented as the UTF-8 [RFC2279] transfer encoding
scheme in which US-ASCII is a subset charset.
'us-ascii': 7-bit American Standard Code for Information
Interchange (ASCII), ANSI X3.4-1986 [ASCII]. That standard
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defines US-ASCII, but RFC 2045 [RFC2045] eliminates most of the
control characters from conformant usage in MIME and IPP.
'iso-8859-1': 8-bit One-Byte Coded Character Set, Latin Alphabet
Nr 1 [ISO8859-1]. That standard defines a coded character set
that is used by Latin languages in the Western Hemisphere and
Western Europe. US-ASCII is a subset charset.
Some attribute descriptions MAY place additional requirements on
charset values that may be used, such as REQUIRED values that MUST be
supported or additional restrictions, such as requiring that the
charset have US- ASCII as a subset charset.
The 'naturalLanguage' attribute syntax is a standard identifier for a
natural language and optionally a country. The values for this
syntax type are defined by RFC 1766 [RFC1766]. Though RFC 1766
requires that the values be case-insensitive US-ASCII [ASCII], IPP
requires all lower case to simplify comparing by IPP clients and
Printer objects. Examples include:
'en': for English
'en-us': for US English
'fr': for French
'de': for German
The maximum length of 'naturalLanguage' values used to represent IPP
attribute values is 63 octets.
The 'mimeMediaType' attribute syntax is the Internet Media Type
(sometimes called MIME type) as defined by RFC 2046 [RFC2046] and
registered according to the procedures of RFC 2048 [RFC2048] for
identifying a document format. The value MAY include a charset, or
other, parameter, depending on the specification of the Media Type in
the IANA Registry [IANA-MT]. Although most other IPP syntax types
allow for only lower-cased values, this syntax type allows for
mixed-case values which are case-insensitive.
Examples are:
'text/html': An HTML document
'text/plain': A plain text document in US-ASCII (RFC 2046
indicates that in the absence of the charset parameter MUST
mean US-ASCII rather than simply unspecified) [RFC2046].
'text/plain; charset=US-ASCII': A plain text document in US-ASCII
[52, 56].
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'text/plain; charset=ISO-8859-1': A plain text document in ISO
8859-1 (Latin 1) [ISO8859-1].
'text/plain; charset=utf-8': A plain text document in ISO 10646
represented as UTF-8 [RFC2279]
'application/postscript': A PostScript document [RFC2046]
'application/vnd.hp-PCL': A PCL document [IANA-MT] (charset
escape sequence embedded in the document data)
'application/pdf': Portable Document Format - see IANA MIME Media
Type registry
'application/octet-stream': Auto-sense - see section 4.1.9.1
The maximum length of a 'mimeMediaType' value to represent IPP
attribute values is 255 octets.
One special type is 'application/octet-stream'. If the Printer
object supports this value, the Printer object MUST be capable of
auto-sensing the format of the document data using an
implementation-dependent method that examines some number of octets
of the document data, either as part of the create operation and/or
at document processing time. During auto-sensing, a Printer may
determine that the document-data has a format that the Printer
doesn't recognize. If the Printer determines this problem before
returning an operation response, it rejects the request and returns
the 'client-error-document-format-not-supported' status code. If the
Printer determines this problem after accepting the request and
returning an operation response with one of the successful status
codes, the Printer adds the 'unsupported-document-format' value to
the job's "job-state-reasons" attribute.
If the Printer object's default value attribute "document-format-
default" is set to 'application/octet-stream', the Printer object not
only supports auto-sensing of the document format, but will depend on
the result of applying its auto-sensing when the client does not
supply the "document-format" attribute. If the client supplies a
document format value, the Printer MUST rely on the supplied
attribute, rather than trust its auto-sensing algorithm. To
summarize:
1. If the client does not supply a document format value, the
Printer MUST rely on its default value setting (which may be
'application/octet-stream' indicating an auto-sensing
mechanism).
2. If the client supplies a value other than 'application/octet-
stream', the client is supplying valid information about the
format of the document data and the Printer object MUST trust
the client supplied value more than the outcome of applying an
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automatic format detection mechanism. For example, the client
may be requesting the printing of a PostScript file as a
'text/plain' document. The Printer object MUST print a text
representation of the PostScript commands rather than interpret
the stream of PostScript commands and print the result.
3. If the client supplies a value of 'application/octet-stream',
the client is indicating that the Printer object MUST use its
auto-sensing mechanism on the client supplied document data
whether auto-sensing is the Printer object's default or not.
Note: Since the auto-sensing algorithm is probabilistic, if the
client requests both auto-sensing ("document-format" set to
'application/octet-stream') and true fidelity ("ipp-attribute-
fidelity" set to 'true'), the Printer object might not be able to
guarantee exactly what the end user intended (the auto-sensing
algorithm might mistake one document format for another), but it is
able to guarantee that its auto-sensing mechanism be used.
When a Printer performs auto-sensing of a document in a submitted
job, it is RECOMMENDED that the Printer indicate to the user that
such auto-sensing has occurred and which document-format was auto-
sensed by printing that information on the job's job-start-sheet.
The 'octetString' attribute syntax is a sequence of octets encoded in
a maximum of 1023 octets which is indicated in sub-section headers
using the notation: octetString(MAX). This syntax type is used for
opaque data.
The 'integer' attribute syntax is an integer value that is in the
range from -2**31 (MIN) to 2**31 - 1 (MAX). Each individual
attribute may specify the range constraint explicitly in sub-section
headers if the range is different from the full range of possible
integer values. For example: job-priority (integer(1:100)) for the
"job-priority" attribute. However, the enforcement of that
additional constraint is up to the IPP objects, not the protocol.
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The 'rangeOfInteger' attribute syntax is an ordered pair of integers
that defines an inclusive range of integer values. The first integer
specifies the lower bound and the second specifies the upper bound.
If a range constraint is specified in the header description for an
attribute in this document whose attribute syntax is 'rangeOfInteger'
(i.e., 'X:Y' indicating X as a minimum value and Y as a maximum
value), then the constraint applies to both integers.
The 'dateTime' attribute syntax is a standard, fixed length, 11 octet
representation of the "DateAndTime" syntax as defined in RFC 2579
[RFC2579]. RFC 2579 also identifies an 8 octet representation of a
"DateAndTime" value, but IPP objects MUST use the 11 octet
representation. A user interface will provide a mapping between
protocol dateTime values and displayable user-friendly words or
presentation values and phrases which are localized to the natural
language and date format of the user, including time zone.
The 'resolution' attribute syntax specifies a two-dimensional
resolution in the indicated units. It consists of 3 values: a cross
feed direction resolution (positive integer value), a feed direction
resolution (positive integer value), and a units value. The
semantics of these three components are taken from the Printer MIB
[RFC1759] suggested values. That is, the cross feed direction
component resolution component is the same as the
prtMarkerAddressabilityXFeedDir object in the Printer MIB, the feed
direction component resolution component is the same as the
prtMarkerAddressabilityFeedDir in the Printer MIB, and the units
component is the same as the prtMarkerAddressabilityUnit object in
the Printer MIB (namely, '3' indicates dots per inch and '4'
indicates dots per centimeter). All three values MUST be present
even if the first two values are the same. Example: '300', '600',
'3' indicates a 300 dpi cross-feed direction resolution, a 600 dpi
feed direction resolution, since a '3' indicates dots per inch (dpi).
The '1setOf X' attribute syntax is 1 or more values of attribute
syntax type X. This syntax type is used for multi-valued attributes.
The syntax type is called '1setOf' rather than just 'setOf' as a
reminder that the set of values MUST NOT be empty (i.e., a set of
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size 0). Sets are normally unordered. However each attribute
description of this type may specify that the values MUST be in a
certain order for that attribute.
Job Template attributes describe job processing behavior. Support
for Job Template attributes by a Printer object is OPTIONAL (see
section 12.2.3 for a description of support for OPTIONAL attributes).
Also, clients OPTIONALLY supply Job Template attributes in create
requests.
Job Template attributes conform to the following rules. For each Job
Template attribute called "xxx":
1. If the Printer object supports "xxx" then it MUST support both
a "xxx-default" attribute (unless there is a "No" in the table
below) and a "xxx-supported" attribute. If the Printer object
doesn't support "xxx", then it MUST support neither an "xxx-
default" attribute nor an "xxx-supported" attribute, and it
MUST treat an attribute "xxx" supplied by a client as
unsupported. An attribute "xxx" may be supported for some
document formats and not supported for other document formats.
For example, it is expected that a Printer object would only
support "orientation-requested" for some document formats (such
as 'text/plain' or 'text/html') but not others (such as
'application/postscript').
2. "xxx" is OPTIONALLY supplied by the client in a create request.
If "xxx" is supplied, the client is indicating a desired job
processing behavior for this Job. When "xxx" is not supplied,
the client is indicating that the Printer object apply its
default job processing behavior at job processing time if the
document content does not contain an embedded instruction
indicating an xxx-related behavior.
Since an administrator MAY change the default value attribute
after a Job object has been submitted but before it has been
processed, the default value used by the Printer object at job
processing time may be different that the default value in
effect at job submission time.
3. The "xxx-supported" attribute is a Printer object attribute
that describes which job processing behaviors are supported by
that Printer object. A client can query the Printer object to
find out what xxx-related behaviors are supported by inspecting
the returned values of the "xxx-supported" attribute.
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Note: The "xxx" in each "xxx-supported" attribute name is
singular, even though an "xxx-supported" attribute usually has
more than one value, such as "job-sheet-supported", unless the
"xxx" Job Template attribute is plural, such as "finishings" or
"sides". In such cases the "xxx-supported" attribute names
are: "finishings- supported" and "sides-supported".
4. The "xxx-default" default value attribute describes what will
be done at job processing time when no other job processing
information is supplied by the client (either explicitly as an
IPP attribute in the create request or implicitly as an
embedded instruction within the document data).
If an application wishes to present an end user with a list of
supported values from which to choose, the application SHOULD query
the Printer object for its supported value attributes. The
application SHOULD also query the default value attributes. If the
application then limits selectable values to only those value that
are supported, the application can guarantee that the values supplied
by the client in the create request all fall within the set of
supported values at the Printer. When querying the Printer, the
client MAY enumerate each attribute by name in the Get-Printer-
Attributes Request, or the client MAY just name the "job-template"
group in order to get the complete set of supported attributes (both
supported and default attributes).
The "finishings" attribute is an example of a Job Template attribute.
It can take on a set of values such as 'staple', 'punch', and/or
'cover'. A client can query the Printer object for the "finishings-
supported" attribute and the "finishings-default" attribute. The
supported attribute contains a set of supported values. The default
value attribute contains the finishing value(s) that will be used for
a new Job if the client does not supply a "finishings" attribute in
the create request and the document data does not contain any
corresponding finishing instructions. If the client does supply the
"finishings" attribute in the create request, the IPP object
validates the value or values to make sure that they are a subset of
the supported values identified in the Printer object's "finishings-
supported" attribute. See section 3.1.7.
The table below summarizes the names and relationships for all Job
Template attributes. The first column of the table (labeled "Job
Attribute") shows the name and syntax for each Job Template attribute
in the Job object. These are the attributes that can optionally be
supplied by the client in a create request. The last two columns
(labeled "Printer: Default Value Attribute" and "Printer: Supported
Values Attribute") show the name and syntax for each Job Template
attribute in the Printer object (the default value attribute and the
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supported values attribute). A "No" in the table means the Printer
MUST NOT support the attribute (that is, the attribute is simply not
applicable). For brevity in the table, the 'text' and 'name' entries
do not show the maximum length for each attribute.
+===================+======================+======================+
| Job Attribute |Printer: Default Value| Printer: Supported |
| | Attribute | Values Attribute |
+===================+======================+======================+
| job-priority | job-priority-default |job-priority-supported|
| (integer 1:100) | (integer 1:100) |(integer 1:100) |
+-------------------+----------------------+----------------------+
| job-hold-until | job-hold-until- |job-hold-until- |
| (type3 keyword | | default | supported |
| name) | (type3 keyword | |(1setOf ( |
| | name) |type3 keyword | name))|
+-------------------+----------------------+----------------------+
| job-sheets | job-sheets-default |job-sheets-supported |
| (type3 keyword | | (type3 keyword | |(1setOf ( |
| name) | name) |type3 keyword | name))|
+-------------------+----------------------+----------------------+
|multiple-document- |multiple-document- |multiple-document- |
| handling | handling-default |handling-supported |
| (type2 keyword) | (type2 keyword) |(1setOf type2 keyword)|
+-------------------+----------------------+----------------------+
| copies | copies-default | copies-supported |
| (integer (1:MAX)) | (integer (1:MAX)) | (rangeOfInteger |
| | | (1:MAX)) |
+-------------------+----------------------+----------------------+
| finishings | finishings-default | finishings-supported |
|(1setOf type2 enum)|(1setOf type2 enum) |(1setOf type2 enum) |
+-------------------+----------------------+----------------------+
| page-ranges | No | page-ranges- |
| (1setOf | | supported (boolean) |
| rangeOfInteger | | |
| (1:MAX)) | | |
+-------------------+----------------------+----------------------+
| sides | sides-default | sides-supported |
| (type2 keyword) | (type2 keyword) |(1setOf type2 keyword)|
+-------------------+----------------------+----------------------+
| number-up | number-up-default | number-up-supported |
| (integer (1:MAX)) | (integer (1:MAX)) |(1setOf (integer |
| | | (1:MAX) | |
| | | rangeOfInteger |
| | | (1:MAX))) |
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+-------------------+----------------------+----------------------+
| orientation- |orientation-requested-|orientation-requested-|
| requested | default | supported |
| (type2 enum) | (type2 enum) | (1setOf type2 enum) |
+-------------------+----------------------+----------------------+
| media | media-default | media-supported |
| (type3 keyword | | (type3 keyword | |(1setOf ( |
| name) | name) |type3 keyword | name))|
| | | |
| | | media-ready |
| | |(1setOf ( |
| | |type3 keyword | name))|
+-------------------+----------------------+----------------------+
| printer-resolution| printer-resolution- | printer-resolution- |
| (resolution) | default | supported |
| | (resolution) |(1setOf resolution) |
+-------------------+----------------------+----------------------+
| print-quality | print-quality-default| print-quality- |
| (type2 enum) | (type2 enum) | supported |
| | |(1setOf type2 enum) |
+-------------------+----------------------+----------------------+
This attribute specifies a priority for scheduling the Job. A higher
value specifies a higher priority. The value 1 indicates the lowest
possible priority. The value 100 indicates the highest possible
priority. Among those jobs that are ready to print, a Printer MUST
print all jobs with a priority value of n before printing those with
a priority value of n-1 for all n.
If the Printer object supports this attribute, it MUST always support
the full range from 1 to 100. No administrative restrictions are
permitted. This way an end-user can always make full use of the
entire range with any Printer object. If privileged jobs are
implemented outside IPP/1.1, they MUST have priorities higher than
100, rather than restricting the range available to end-users.
If the client does not supply this attribute and this attribute is
supported by the Printer object, the Printer object MUST use the
value of the Printer object's "job-priority-default" at job
submission time (unlike most Job Template attributes that are used if
necessary at job processing time).
The syntax for the "job-priority-supported" is also integer(1:100).
This single integer value indicates the number of priority levels
supported. The Printer object MUST take the value supplied by the
client and map it to the closest integer in a sequence of n integers
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values that are evenly distributed over the range from 1 to 100 using
the formula:
roundToNearestInt((100x+50)/n)
where n is the value of "job-priority-supported" and x ranges from 0
through n-1.
For example, if n=1 the sequence of values is 50; if n=2, the
sequence of values is: 25 and 75; if n = 3, the sequence of values
is: 17, 50 and 83; if n = 10, the sequence of values is: 5, 15, 25,
35, 45, 55, 65, 75, 85, and 95; if n = 100, the sequence of values
is: 1, 2, 3, ... 100.
If the value of the Printer object's "job-priority-supported" is 10
and the client supplies values in the range 1 to 10, the Printer
object maps them to 5, in the range 11 to 20, the Printer object maps
them to 15, etc.
This attribute specifies the named time period during which the Job
MUST become a candidate for printing.
Standard keyword values for named time periods are:
'no-hold': immediately, if there are not other reasons to hold the
job
'indefinite': - the job is held indefinitely, until a client
performs a Release-Job (section 3.3.6)
'day-time': during the day
'evening': evening
'night': night
'weekend': weekend
'second-shift': second-shift (after close of business)
'third-shift': third-shift (after midnight)
An administrator MUST associate allowable print times with a named
time period (by means outside the scope of this IPP/1.1 document).
An administrator is encouraged to pick names that suggest the type of
time period. An administrator MAY define additional values using the
'name' or 'keyword' attribute syntax, depending on implementation.
If the value of this attribute specifies a time period that is in the
future, the Printer SHOULD add the 'job-hold-until-specified' value
to the job's "job-state-reasons" attribute, MUST move the job to the
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'pending-held' state, and MUST NOT schedule the job for printing
until the specified time-period arrives.
When the specified time period arrives, the Printer MUST remove the
'job-hold-until-specified' value from the job's "job-state-reason"
attribute, if present. If there are no other job state reasons that
keep the job in the 'pending-held' state, the Printer MUST consider
the job as a candidate for processing by moving the job to the
'pending' state.
If this job attribute value is the named value 'no-hold', or the
specified time period has already started, the job MUST be a
candidate for processing immediately.
If the client does not supply this attribute and this attribute is
supported by the Printer object, the Printer object MUST use the
value of the Printer object's "job-hold-until-default" at job
submission time (unlike most Job Template attributes that are used if
necessary at job processing time).
This attribute determines which job start/end sheet(s), if any, MUST
be printed with a job.
Standard keyword values are:
'none': no job sheet is printed
'standard': one or more site specific standard job sheets are
printed, e.g. a single start sheet or both start and end sheet is
printed
An administrator MAY define additional values using the 'name' or
'keyword' attribute syntax, depending on implementation.
The effect of this attribute on jobs with multiple documents MAY be
affected by the "multiple-document-handling" job attribute (section
4.2.4), depending on the job sheet semantics.
This attribute is relevant only if a job consists of two or more
documents. This attribute MUST be supported with at least one value
if the Printer supports multiple documents per job (see sections
3.2.4 and 3.3.1). The attribute controls finishing operations and
the placement of one or more print-stream pages into impressions and
onto media sheets. When the value of the "copies" attribute exceeds
1, it also controls the order in which the copies that result from
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processing the documents are produced. For the purposes of this
explanations, if "a" represents an instance of document data, then
the result of processing the data in document "a" is a sequence of
media sheets represented by "a(*)".
Standard keyword values are:
'single-document': If a Job object has multiple documents, say,
the document data is called a and b, then the result of
processing all the document data (a and then b) MUST be treated
as a single sequence of media sheets for finishing operations;
that is, finishing would be performed on the concatenation of
the sequences a(*),b(*). The Printer object MUST NOT force the
data in each document instance to be formatted onto a new
print-stream page, nor to start a new impression on a new media
sheet. If more than one copy is made, the ordering of the sets
of media sheets resulting from processing the document data
MUST be a(*), b(*), a(*), b(*), start on a new media sheet.
'separate-documents-uncollated-copies': If a Job object has
multiple documents, say, the document data is called a and b,
then the result of processing the data in each document
instance MUST be treated as a single sequence of media sheets
for finishing operations; that is, the sets a(*) and b(*) would
each be finished separately. The Printer object MUST force each
copy of the result of processing the data in a single document
to start on a new media sheet. If more than one copy is made,
the ordering of the sets of media sheets resulting from
processing the document data MUST be a(*), a(*), ..., b(*),
b(*) ... .
'separate-documents-collated-copies': If a Job object has multiple
documents, say, the document data is called a and b, then the
result of processing the data in each document instance MUST be
treated as a single sequence of media sheets for finishing
operations; that is, the sets a(*) and b(*) would each be
finished separately. The Printer object MUST force each copy of
the result of processing the data in a single document to start
on a new media sheet. If more than one copy is made, the
ordering of the sets of media sheets resulting from processing
the document data MUST be a(*), b(*), a(*), b(*), ... .
'single-document-new-sheet': Same as 'single-document', except
that the Printer object MUST ensure that the first impression
of each document instance in the job is placed on a new media
sheet. This value allows multiple documents to be stapled
together with a single staple where each document starts on a
new sheet.
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The 'single-document' value is the same as 'separate-documents-
collated-copies' with respect to ordering of print-stream pages, but
not media sheet generation, since 'single-document' will put the
first page of the next document on the back side of a sheet if an odd
number of pages have been produced so far for the job, while
'separate-documents-collated- copies' always forces the next document
or document copy on to a new sheet. In addition, if the "finishings"
attribute specifies 'staple', then with 'single-document', documents
a and b are stapled together as a single document with no regard to
new sheets, with 'single-document-new-sheet', documents a and b are
stapled together as a single document, but document b starts on a new
sheet, but with 'separate-documents-uncollated-copies' and
'separate-documents-collated-copies', documents a and b are stapled
separately.
Note: None of these values provide means to produce uncollated sheets
within a document, i.e., where multiple copies of sheet n are
produced before sheet n+1 of the same document.
The relationship of this attribute and the other attributes that
control document processing is described in section 15.3.
This attribute specifies the number of copies to be printed.
On many devices the supported number of collated copies will be
limited by the number of physical output bins on the device, and may
be different from the number of uncollated copies which can be
supported.
Note: The effect of this attribute on jobs with multiple documents is
controlled by the "multiple-document-handling" job attribute (section
4.2.4) and the relationship of this attribute and the other
attributes that control document processing is described in section
15.3.
This attribute identifies the finishing operations that the Printer
uses for each copy of each printed document in the Job. For Jobs with
multiple documents, the "multiple-document-handling" attribute
determines what constitutes a "copy" for purposes of finishing.
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Standard enum values are:
Value Symbolic Name and Description
'3' 'none': Perform no finishing
'4' 'staple': Bind the document(s) with one or more staples. The
exact number and placement of the staples is site-
defined.
'5' 'punch': This value indicates that holes are required in the
finished document. The exact number and placement of the
holes is site-defined The punch specification MAY be
satisfied (in a site- and implementation-specific manner)
either by drilling/punching, or by substituting pre-
drilled media.
'6' 'cover': This value is specified when it is desired to select
a non-printed (or pre-printed) cover for the document.
This does not supplant the specification of a printed
cover (on cover stock medium) by the document itself.
'7' 'bind': This value indicates that a binding is to be applied
to the document; the type and placement of the binding is
site-defined.
'8' 'saddle-stitch': Bind the document(s) with one or more
staples (wire stitches) along the middle fold. The exact
number and placement of the staples and the middle fold
is implementation and/or site-defined.
'9' 'edge-stitch': Bind the document(s) with one or more staples
(wire stitches) along one edge. The exact number and
placement of the staples is implementation and/or site-
defined.
'10'-'19' reserved for future generic finishing enum values.
The following values are more specific; they indicate a corner or an
edge as if the document were a portrait document (see below):
'20' 'staple-top-left': Bind the document(s) with one or more
staples in the top left corner.
'21' 'staple-bottom-left': Bind the document(s) with one or more
staples in the bottom left corner.
'22' 'staple-top-right': Bind the document(s) with one or more
staples in the top right corner.
'23' 'staple-bottom-right': Bind the document(s) with one or more
staples in the bottom right corner.
'24' 'edge-stitch-left': Bind the document(s) with one or more
staples (wire stitches) along the left edge. The exact
number and placement of the staples is implementation
and/or site-defined.
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'25' 'edge-stitch-top': Bind the document(s) with one or more
staples (wire stitches) along the top edge. The exact
number and placement of the staples is implementation
and/or site-defined.
'26' 'edge-stitch-right': Bind the document(s) with one or more
staples (wire stitches) along the right edge. The exact
number and placement of the staples is implementation
and/or site-defined.
'27' 'edge-stitch-bottom': Bind the document(s) with one or more
staples (wire stitches) along the bottom edge. The exact
number and placement of the staples is implementation
and/or site-defined.
'28' 'staple-dual-left': Bind the document(s) with two staples
(wire stitches) along the left edge assuming a portrait
document (see above).
'29' 'staple-dual-top': Bind the document(s) with two staples
(wire stitches) along the top edge assuming a portrait
document (see above).
'30' 'staple-dual-right': Bind the document(s) with two staples
(wire stitches) along the right edge assuming a portrait
document (see above).
'31' 'staple-dual-bottom': Bind the document(s) with two staples
(wire stitches) along the bottom edge assuming a portrait
document (see above).
The 'staple-xxx' values are specified with respect to the document as
if the document were a portrait document. If the document is
actually a landscape or a reverse-landscape document, the client
supplies the appropriate transformed value. For example, to position
a staple in the upper left hand corner of a landscape document when
held for reading, the client supplies the 'staple-bottom-left' value
(since landscape is defined as a +90 degree rotation of the image
with respect to the media from portrait, i.e., anti-clockwise). On
the other hand, to position a staple in the upper left hand corner of
a reverse-landscape document when held for reading, the client
supplies the 'staple-top-right' value (since reverse-landscape is
defined as a -90 degree rotation of the image with respect to the
media from portrait, i.e., clockwise).
The angle (vertical, horizontal, angled) of each staple with respect
to the document depends on the implementation which may in turn
depend on the value of the attribute.
Note: The effect of this attribute on jobs with multiple documents is
controlled by the "multiple-document-handling" job attribute (section
4.2.4) and the relationship of this attribute and the other
attributes that control document processing is described in section
15.3.
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If the client supplies a value of 'none' along with any other
combination of values, it is the same as if only that other
combination of values had been supplied (that is the 'none' value has
no effect).
This attribute identifies the range(s) of print-stream pages that the
Printer object uses for each copy of each document which are to be
printed. Nothing is printed for any pages identified that do not
exist in the document(s). Ranges MUST be in ascending order, for
example: 1-3, 5-7, 15-19 and MUST NOT overlap, so that a non-spooling
Printer object can process the job in a single pass. If the ranges
are not ascending or are overlapping, the IPP object MUST reject the
request and return the 'client-error-bad-request' status code. The
attribute is associated with print-stream pages not application-
numbered pages (for example, the page numbers found in the headers
and or footers for certain word processing applications).
For Jobs with multiple documents, the "multiple-document-handling"
attribute determines what constitutes a "copy" for purposes of the
specified page range(s). When "multiple-document-handling" is
'single-document', the Printer object MUST apply each supplied page
range once to the concatenation of the print-stream pages. For
example, if there are 8 documents of 10 pages each, the page-range
'41:60' prints the pages in the 5th and 6th documents as a single
document and none of the pages of the other documents are printed.
When "multiple-document- handling" is 'separate-documents-
uncollated-copies' or 'separate-documents-collated-copies', the
Printer object MUST apply each supplied page range repeatedly to each
document copy. For the same job, the page-range '1:3, 10:10' would
print the first 3 pages and the 10th page of each of the 8 documents
in the Job, as 8 separate documents.
In most cases, the exact pages to be printed will be generated by a
device driver and this attribute would not be required. However,
when printing an archived document which has already been formatted,
the end user may elect to print just a subset of the pages contained
in the document. In this case, if page-range = n.m is specified, the
first page to be printed will be page n. All subsequent pages of the
document will be printed through and including page m.
"page-ranges-supported" is a boolean value indicating whether or not
the printer is capable of supporting the printing of page ranges.
This capability may differ from one PDL to another. There is no
"page-ranges-default" attribute. If the "page-ranges" attribute is
not supplied by the client, all pages of the document will be
printed.
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Note: The effect of this attribute on jobs with multiple documents is
controlled by the "multiple-document-handling" job attribute (section
4.2.4) and the relationship of this attribute and the other
attributes that control document processing is described in section
15.3.
This attribute specifies how print-stream pages are to be imposed
upon the sides of an instance of a selected medium, i.e., an
impression.
The standard keyword values are:
'one-sided': imposes each consecutive print-stream page upon the
same side of consecutive media sheets.
'two-sided-long-edge': imposes each consecutive pair of print-
stream pages upon front and back sides of consecutive media
sheets, such that the orientation of each pair of print-stream
pages on the medium would be correct for the reader as if for
binding on the long edge. This imposition is sometimes called
'duplex' or 'head-to-head'.
'two-sided-short-edge': imposes each consecutive pair of print-
stream pages upon front and back sides of consecutive media
sheets, such that the orientation of each pair of print-stream
pages on the medium would be correct for the reader as if for
binding on the short edge. This imposition is sometimes called
'tumble' or 'head-to-toe'.
'two-sided-long-edge', 'two-sided-short-edge',
'tumble', and 'duplex' all work the same for portrait or
landscape. However
'head-to-toe' is
'tumble' in portrait but 'duplex' in landscape. 'head-to-head'
also switches between 'duplex' and 'tumble' when using portrait
and landscape modes.
Note: The effect of this attribute on jobs with multiple documents is
controlled by the "multiple-document-handling" job attribute (section
4.2.4) and the relationship of this attribute and the other
attributes that control document processing is described in section
15.3.
This attribute specifies the number of print-stream pages to impose
upon a single side of an instance of a selected medium. For example,
if the value is:
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Value Description
'1' the Printer MUST place one print-stream page on a single side
of an instance of the selected medium (MAY add some sort
of translation, scaling, or rotation).
'2' the Printer MUST place two print-stream pages on a single side
of an instance of the selected medium (MAY add some sort
of translation, scaling, or rotation).
'4' the Printer MUST place four print-stream pages on a single
side of an instance of the selected medium (MAY add some
sort of translation, scaling, or rotation).
This attribute primarily controls the translation, scaling and
rotation of print-stream pages.
Note: The effect of this attribute on jobs with multiple documents is
controlled by the "multiple-document-handling" job attribute (section
4.2.4) and the relationship of this attribute and the other
attributes that control document processing is described in section
15.3.
This attribute indicates the desired orientation for printed print-
stream pages; it does not describe the orientation of the client-
supplied print-stream pages.
For some document formats (such as 'application/postscript'), the
desired orientation of the print-stream pages is specified within the
document data. This information is generated by a device driver
prior to the submission of the print job. Other document formats
(such as 'text/plain') do not include the notion of desired
orientation within the document data. In the latter case it is
possible for the Printer object to bind the desired orientation to
the document data after it has been submitted. It is expected that a
Printer object would only support "orientations-requested" for some
document formats (e.g., 'text/plain' or 'text/html') but not others
(e.g., 'application/postscript'). This is no different than any
other Job Template attribute since section 4.2, item 1, points out
that a Printer object may support or not support any Job Template
attribute based on the document format supplied by the client.
However, a special mention is made here since it is very likely that
a Printer object will support "orientation-requested" for only a
subset of the supported document formats.
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Standard enum values are:
Value Symbolic Name and Description
'3' 'portrait': The content will be imaged across the short edge
of the medium.
'4' 'landscape': The content will be imaged across the long edge
of the medium. Landscape is defined to be a rotation of
the print-stream page to be imaged by +90 degrees with
respect to the medium (i.e. anti-clockwise) from the
portrait orientation. Note: The +90 direction was
chosen because simple finishing on the long edge is the
same edge whether portrait or landscape
'5' 'reverse-landscape': The content will be imaged across the
long edge of the medium. Reverse-landscape is defined to
be a rotation of the print-stream page to be imaged by -
90 degrees with respect to the medium (i.e. clockwise)
from the portrait orientation. Note: The 'reverse-
landscape' value was added because some applications
rotate landscape -90 degrees from portrait, rather than
+90 degrees.
'6' 'reverse-portrait': The content will be imaged across the
short edge of the medium. Reverse-portrait is defined to
be a rotation of the print-stream page to be imaged by
180 degrees with respect to the medium from the portrait
orientation. Note: The 'reverse-portrait' value was
added for use with the "finishings" attribute in cases
where the opposite edge is desired for finishing a
portrait document on simple finishing devices that have
only one finishing position. Thus a 'text'/plain'
portrait document can be stapled "on the right" by a
simple finishing device as is common use with some middle
eastern languages such as Hebrew.
Note: The effect of this attribute on jobs with multiple documents is
controlled by the "multiple-document-handling" job attribute (section
4.2.4) and the relationship of this attribute and the other
attributes that control document processing is described in section
15.3.
This attribute identifies the medium that the Printer uses for all
impressions of the Job.
The values for "media" include medium-names, medium-sizes, input-
trays and electronic forms so that one attribute specifies the media.
If a Printer object supports a medium name as a value of this
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attribute, such a medium name implicitly selects an input-tray that
contains the specified medium. If a Printer object supports a medium
size as a value of this attribute, such a medium size implicitly
selects a medium name that in turn implicitly selects an input-tray
that contains the medium with the specified size. If a Printer
object supports an input-tray as the value of this attribute, such an
input-tray implicitly selects the medium that is in that input-tray
at the time the job prints. This case includes manual-feed input-
trays. If a Printer object supports an electronic form as the value
of this attribute, such an electronic form implicitly selects a
medium-name that in turn implicitly selects an input-tray that
contains the medium specified by the electronic form. The electronic
form also implicitly selects an image that the Printer MUST merge
with the document data as its prints each page.
Standard keyword values are taken from ISO DPA [ISO10175], the
Printer MIB [RFC1759], and ASME-Y14.1M [ASME-Y14.1M] and are listed
in section 14. An administrator MAY define additional values using
the 'name' or 'keyword' attribute syntax, depending on
implementation.
There is also an additional Printer attribute named "media-ready"
which differs from "media-supported" in that legal values only
include the subset of "media-supported" values that are physically
loaded and ready for printing with no operator intervention required.
If an IPP object supports "media-supported", it NEED NOT support
"media-ready".
The relationship of this attribute and the other attributes that
control document processing is described in section 15.3.
This attribute specifies the print quality that the Printer uses for
the Job.
The standard enum values are:
Value Symbolic Name and Description
'3' 'draft': lowest quality available on the printer
'4' 'normal': normal or intermediate quality on the printer
'5' 'high': highest quality available on the printer
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This REQUIRED attribute contains the URI for the job. The Printer
object, on receipt of a new job, generates a URI which identifies the
new Job. The Printer object returns the value of the "job-uri"
attribute as part of the response to a create request. The precise
format of a Job URI is implementation dependent. If the Printer
object supports more than one URI and there is some relationship
between the newly formed Job URI and the Printer object's URI, the
Printer object uses the Printer URI supplied by the client in the
create request. For example, if the create request comes in over a
secure channel, the new Job URI MUST use the same secure channel.
This can be guaranteed because the Printer object is responsible for
generating the Job URI and the Printer object is aware of its
security configuration and policy as well as the Printer URI used in
the create request.
For a description of this attribute and its relationship to "job-id"
and "job-printer-uri" attribute, see the discussion in section 2.4 on
"Object Identity".
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This REQUIRED attribute contains the ID of the job. The Printer, on
receipt of a new job, generates an ID which identifies the new Job on
that Printer. The Printer returns the value of the "job-id"
attribute as part of the response to a create request. The 0 value
is not included to allow for compatibility with SNMP index values
which also cannot be 0.
For a description of this attribute and its relationship to "job-uri"
and "job-printer-uri" attribute, see the discussion in section 2.4 on
"Object Identity".
This REQUIRED attribute identifies the Printer object that created
this Job object. When a Printer object creates a Job object, it
populates this attribute with the Printer object URI that was used in
the create request. This attribute permits a client to identify the
Printer object that created this Job object when only the Job
object's URI is available to the client. The client queries the
creating Printer object to determine which languages, charsets,
operations, are supported for this Job.
For a description of this attribute and its relationship to "job-uri"
and "job-id" attribute, see the discussion in section 2.4 on "Object
Identity".
Similar to "printer-more-info", this attribute contains the URI
referencing some resource with more information about this Job
object, perhaps an HTML page containing information about the Job.
This REQUIRED attribute is the name of the job. It is a name that is
more user friendly than the "job-uri" attribute value. It does not
need to be unique between Jobs. The Job's "job-name" attribute is
set to the value supplied by the client in the "job-name" operation
attribute in the create request (see Section 3.2.1.1). If, however,
the "job-name" operation attribute is not supplied by the client in
the create request, the Printer object, on creation of the Job, MUST
generate a name. The printer SHOULD generate the value of the Job's
"job-name" attribute from the first of the following sources that
produces a value: 1) the "document-name" operation attribute of the
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first (or only) document, 2) the "document-URI" attribute of the
first (or only) document, or 3) any other piece of Job specific
and/or Document Content information.
This REQUIRED attribute contains the name of the end user that
submitted the print job. The Printer object sets this attribute to
the most authenticated printable name that it can obtain from the
authentication service over which the IPP operation was received.
Only if such is not available, does the Printer object use the value
supplied by the client in the "requesting-user-name" operation
attribute of the create operation (see Sections 4.4.2, 4.4.3, and 8).
Note: The Printer object needs to keep an internal originating user
id of some form, typically as a credential of a principal, with the
Job object. Since such an internal attribute is implementation-
dependent and not of interest to clients, it is not specified as a
Job Description attribute. This originating user id is used for
authorization checks (if any) on all subsequent operations.
This REQUIRED attribute identifies the current state of the job.
Even though the IPP protocol defines seven values for job states
(plus the out-of-band 'unknown' value - see Section 4.1),
implementations only need to support those states which are
appropriate for the particular implementation. In other words, a
Printer supports only those job states implemented by the output
device and available to the Printer object implementation.
Standard enum values are:
Values Symbolic Name and Description
'3' 'pending': The job is a candidate to start processing, but is
not yet processing.
'4' 'pending-held': The job is not a candidate for processing for
any number of reasons but will return to the 'pending'
state as soon as the reasons are no longer present. The
job's "job-state-reason" attribute MUST indicate why the
job is no longer a candidate for processing.
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'5' 'processing': One or more of:
1. the job is using, or is attempting to use, one or
more purely software processes that are analyzing,
creating, or interpreting a PDL, etc.,
2. the job is using, or is attempting to use, one or
more hardware devices that are interpreting a PDL, making
marks on a medium, and/or performing finishing, such as
stapling, etc.,
3. the Printer object has made the job ready for
printing, but the output device is not yet printing it,
either because the job hasn't reached the output device
or because the job is queued in the output device or some
other spooler, awaiting the output device to print it.
When the job is in the 'processing' state, the entire job
state includes the detailed status represented in the
Printer object's "printer-state", "printer-state-
reasons", and "printer-state-message" attributes.
Implementations MAY, though they NEED NOT, include
additional values in the job's "job-state-reasons"
attribute to indicate the progress of the job, such as
adding the 'job-printing' value to indicate when the
output device is actually making marks on paper and/or
the 'processing-to-stop-point' value to indicate that the
IPP object is in the process of canceling or aborting the
job. Most implementations won't bother with this nuance.
'6' 'processing-stopped': The job has stopped while processing
for any number of reasons and will return to the
'processing' state as soon as the reasons are no longer
present.
The job's "job-state-reason" attribute MAY indicate why
the job has stopped processing. For example, if the
output device is stopped, the 'printer-stopped' value MAY
be included in the job's "job-state-reasons" attribute.
Note: When an output device is stopped, the device
usually indicates its condition in human readable form
locally at the device. A client can obtain more complete
device status remotely by querying the Printer object's
"printer-state", "printer-state-reasons" and "printer-
state-message" attributes.
'7' 'canceled': The job has been canceled by a Cancel-Job
operation and the Printer object has completed canceling
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the job and all job status attributes have reached their
final values for the job. While the Printer object is
canceling the job, the job remains in its current state,
but the job's "job-state-reasons" attribute SHOULD
contain the 'processing-to-stop-point' value and one of
the 'canceled-by-user', 'canceled-by-operator', or
'canceled-at-device' value. When the job moves to the
'canceled' state, the 'processing-to-stop-point' value,
if present, MUST be removed, but the 'canceled-by-xxx',
if present, MUST remain.
'8' 'aborted': The job has been aborted by the system, usually
while the job was in the 'processing' or 'processing-
stopped' state and the Printer has completed aborting the
job and all job status attributes have reached their
final values for the job. While the Printer object is
aborting the job, the job remains in its current state,
but the job's "job-state-reasons" attribute SHOULD
contain the 'processing-to-stop-point' and 'aborted-by-
system' values. When the job moves to the 'aborted'
state, the 'processing-to-stop-point' value, if present,
MUST be removed, but the 'aborted-by-system' value, if
present, MUST remain.
'9' 'completed': The job has completed successfully or with
warnings or errors after processing and all of the job
media sheets have been successfully stacked in the
appropriate output bin(s) and all job status attributes
have reached their final values for the job. The job's
"job-state-reasons" attribute SHOULD contain one of:
'completed-successfully', 'completed-with-warnings', or
'completed-with-errors' values.
The final value for this attribute MUST be one of: 'completed',
'canceled', or 'aborted' before the Printer removes the job
altogether. The length of time that jobs remain in the 'canceled',
'aborted', and 'completed' states depends on implementation. See
section 4.3.7.2.
The following figure shows the normal job state transitions.
+----> canceled
/
+----> pending --------> processing ---------+------> completed
| ^ ^ \
--->+ | | +----> aborted
| v v /
+----> pending-held processing-stopped ---+
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Normally a job progresses from left to right. Other state
transitions are unlikely, but are not forbidden. Not shown are the
transitions to the 'canceled' state from the 'pending', 'pending-
held', and 'processing-stopped' states.
Jobs reach one of the three terminal states: 'completed', 'canceled',
or 'aborted', after the jobs have completed all activity, including
stacking output media, after the jobs have completed all activity,
and all job status attributes have reached their final values for the
job.
As with all other IPP attributes, if the implementation cannot
determine the correct value for this attribute, it SHOULD respond
with the out-of-band value 'unknown' (see section 4.1) rather than
try to guess at some possibly incorrect value and give the end user
the wrong impression about the state of the Job object. For example,
if the implementation is just a gateway into some printing system
from which it can normally get status, but temporarily is unable,
then the implementation should return the 'unknown' value. However,
if the implementation is a gateway to a printing system that never
provides detailed status about the print job, the implementation MAY
set the IPP Job object's state to 'completed', provided that it also
sets the 'queued-in-device' value in the job's "job-state-reasons"
attribute (see section 4.3.8).
This section partitions the 7 job states into phases: Job Not
Completed, Job Retention, Job History, and Job Removal. This section
also explains the 'job-restartable' value of the "job-state-reasons"
Job Description attribute for use with the Restart-Job operation.
Job Not Completed: When a job is in the 'pending', 'pending-held',
'processing', or 'processing-stopped' states, the job is not
completed.
Job Retention: When a job enters one of the three terminal job
states: 'completed', 'canceled', or 'aborted', the IPP Printer
object MAY "retain" the job in a restartable condition for an
implementation-defined time period. This time period MAY be zero
seconds and MAY depend on the terminal job state. This phase is
called Job Retention. While in the Job Retention phase, the job's
document data is retained and a client may restart the job using the
Restart-Job operation. If the IPP object supports the Restart-Job
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operation, then it SHOULD indicate that the job is restartable by
adding the 'job-restartable' value to the job's "job-state-reasons"
attribute (see Section 4.3.8) during the Job Retention phase.
Job History: After the Job Retention phase expires for a job, the
Printer object deletes the document data for the job and the job
becomes part of the Job History. The Printer object MAY also delete
any number of the job attributes. Since the job is no longer
restartable, the Printer object MUST remove the 'job-restartable'
value from the job's "job-state-reasons" attribute, if present.
Job Removal: After the job has remained in the Job History for an
implementation-defined time, such as when the number of jobs exceeds
a fixed number or after a fixed time period (which MAY be zero
seconds), the IPP Printer removes the job from the system.
Using the Get-Jobs operation and supplying the 'not-completed' value
for the "which-jobs" operation attribute, a client is requesting jobs
in the Job Not Completed phase. Using the Get-Jobs operation and
supplying the 'completed' value for the "which-jobs" operation
attribute, a client is requesting jobs in the Job Retention and Job
History phases. Using the Get-Job-Attributes operation, a client is
requesting a job in any phase except Job Removal. After Job Removal,
the Get-Job-Attributes and Get-Jobs operations no longer are capable
of returning any information about a job.
This REQUIRED attribute provides additional information about the
job's current state, i.e., information that augments the value of the
job's "job-state" attribute.
These values MAY be used with any job state or states for which the
reason makes sense. Some of these value definitions indicate
conformance requirements; the rest are OPTIONAL. Furthermore, when
implemented, the Printer MUST return these values when the reason
applies and MUST NOT return them when the reason no longer applies
whether the value of the Job's "job-state" attribute changed or not.
When the Job does not have any reasons for being in its current
state, the value of the Job's "job-state-reasons" attribute MUST be
'none'.
Note: While values cannot be added to the 'job-state' attribute
without impacting deployed clients that take actions upon receiving
"job-state" values, it is the intent that additional "job-state-
reasons" values can be defined and registered without impacting such
deployed clients. In other words, the "job-state-reasons" attribute
is intended to be extensible.
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The following standard keyword values are defined. For ease of
understanding, the values are presented in the order in which the
reasons are likely to occur (if implemented), starting with the
'job-incoming' value:
'none': There are no reasons for the job's current state. This
state reason is semantically equivalent to "job-state-reasons"
without any value and MUST be used when there is no other
value, since the 1setOf attribute syntax requires at least one
value.
'job-incoming': Either (1) the Printer has accepted the Create-
Job operation and is expecting additional Send-Document and/or
Send-URI operations, or (2) the Printer is retrieving/accepting
document data as a result of a Print-Job, Print-URI, Send-
Document or Send-URI operation.
'job-data-insufficient': The Create-Job operation has been
accepted by the Printer, but the Printer is expecting
additional document data before it can move the job into the
'processing' state. If a Printer starts processing before it
has received all data, the Printer removes the 'job-data-
insufficient' reason, but the 'job-incoming' remains. If a
Printer starts processing after it has received all data, the
Printer removes the 'job-data-insufficient' reason and the
'job-incoming' at the same time.
'document-access-error': After accepting a Print-URI or Send-URI
request, the Printer could not access one or more documents
passed by reference. This reason is intended to cover any file
access problem, including file does not exist and access denied
because of an access control problem. The Printer MAY also
indicate the document access error using the "job-document-
access-errors" Job Description attribute (see section 4.3.11).
Whether the Printer aborts the job and moves the job to the
'aborted' job state or prints all documents that are accessible
and moves the job to the 'completed' job state and adds the
'completed-with-errors' value in the job's "job-state-reasons"
attribute depends on implementation and/or site policy. This
value SHOULD be supported if the Print-URI or Send-URI
operations are supported.
'submission-interrupted': The job was not completely submitted
for some unforeseen reason, such as: (1) the Printer has
crashed before the job was closed by the client, (2) the
Printer or the document transfer method has crashed in some
non-recoverable way before the document data was entirely
transferred to the Printer, (3) the client crashed or failed to
close the job before the time-out period. See section 4.4.31.
'job-outgoing': The Printer is transmitting the job to the output
device.
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'job-hold-until-specified': The value of the job's "job-hold-
until" attribute was specified with a time period that is still
in the future. The job MUST NOT be a candidate for processing
until this reason is removed and there are no other reasons to
hold the job. This value SHOULD be supported if the "job-
hold-until" Job Template attribute is supported.
'resources-are-not-ready': At least one of the resources needed
by the job, such as media, fonts, resource objects, etc., is
not ready on any of the physical printer's for which the job is
a candidate. This condition MAY be detected when the job is
accepted, or subsequently while the job is pending or
processing, depending on implementation. The job may remain in
its current state or be moved to the 'pending-held' state,
depending on implementation and/or job scheduling policy.
'printer-stopped-partly': The value of the Printer's "printer-
state-reasons" attribute contains the value 'stopped-partly'.
'printer-stopped': The value of the Printer's "printer-state"
attribute is 'stopped'.
'job-interpreting': Job is in the 'processing' state, but more
specifically, the Printer is interpreting the document data.
'job-queued': Job is in the 'processing' state, but more
specifically, the Printer has queued the document data.
'job-transforming': Job is in the 'processing' state, but more
specifically, the Printer is interpreting document data and
producing another electronic representation.
'job-queued-for-marker': Job is in any of the 'pending-held',
'pending', or 'processing' states, but more specifically, the
Printer has completed enough processing of the document to be
able to start marking and the job is waiting for the marker.
Systems that require human intervention to release jobs using
the Release-Job operation, put the job into the 'pending-held'
job state. Systems that automatically select a job to use the
marker put the job into the 'pending' job state or keep the
job in the 'processing' job state while waiting for the marker,
depending on implementation. All implementations put the job
into (or back into) the 'processing' state when marking does
begin.
'job-printing': The output device is marking media. This value is
useful for Printers which spend a great deal of time processing
(1) when no marking is happening and then want to show that
marking is now happening or (2) when the job is in the process
of being canceled or aborted while the job remains in the
'processing' state, but the marking has not yet stopped so that
impression or sheet counts are still increasing for the job.
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'job-canceled-by-user': The job was canceled by the owner of the
job using the Cancel-Job request, i.e., by a user whose
authenticated identity is the same as the value of the
originating user that created the Job object, or by some other
authorized end-user, such as a member of the job owner's
security group. This value SHOULD be supported.
'job-canceled-by-operator': The job was canceled by the operator
using the Cancel-Job request, i.e., by a user who has been
authenticated as having operator privileges (whether local or
remote). If the security policy is to allow anyone to cancel
anyone's job, then this value may be used when the job is
canceled by other than the owner of the job. For such a
security policy, in effect, everyone is an operator as far as
canceling jobs with IPP is concerned. This value SHOULD be
supported if the implementation permits canceling by other than
the owner of the job.
'job-canceled-at-device': The job was canceled by an unidentified
local user, i.e., a user at a console at the device. This
value SHOULD be supported if the implementation supports
canceling jobs at the console.
'aborted-by-system': The job (1) is in the process of being
aborted, (2) has been aborted by the system and placed in the
'aborted' state, or (3) has been aborted by the system and
placed in the 'pending-held' state, so that a user or operator
can manually try the job again. This value SHOULD be
supported.
'unsupported-compression': The job was aborted by the system
because the Printer determined while attempting to decompress
the document-data's that the compression is actually not among
those supported by the Printer. This value MUST be supported,
since "compressions is a REQUIRED operation attribute.
'compression-error': The job was aborted by the system because the
Printer encountered an error in the document-data while
decompressing it. If the Printer posts this reason, the
document-data has already passed any tests that would have led
to the 'unsupported-compression' job-state-reason.
'unsupported-document-format': The job was aborted by the system
because the document-data's document-format is not among those
supported by the Printer. If the client specifies the
document-format as 'application/octet-stream', the printer MAY
abort the job and post this reason even though the format is a
member of the "document-format-supported" printer attribute,
but not among the auto-sensed document-formats. This value
MUST be supported, since "document-format" is a REQUIRED
operation attribute.
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'document-format-error': The job was aborted by the system because
the Printer encountered an error in the document-data while
processing it. If the Printer posts this reason, the
document-data has already passed any tests that would have led
to the 'unsupported-document-format' job-state-reason.
'processing-to-stop-point': The requester has issued a Cancel-Job
operation or the Printer object has aborted the job, but is
still performing some actions on the job until a specified stop
point occurs or job termination/cleanup is completed.
If the implementation requires some measurable time to cancel
the job in the 'processing' or 'processing-stopped' job states,
the IPP object MUST use this value to indicate that the Printer
object is still performing some actions on the job while the
job remains in the 'processing' or 'processing-stopped' state.
After all the job's job description attributes have stopped
incrementing, the Printer object moves the job from the
'processing' state to the 'canceled' or
'aborted' job states.
'service-off-line': The Printer is off-line and accepting no
jobs. All 'pending' jobs are put into the 'pending-held'
state. This situation could be true if the service's or
document transform's input is impaired or broken.
'job-completed-successfully': The job completed successfully.
This value SHOULD be supported.
'job-completed-with-warnings': The job completed with warnings.
This value SHOULD be supported if the implementation detects
warnings.
'job-completed-with-errors': The job completed with errors (and
possibly warnings too). This value SHOULD be supported if the
implementation detects errors.
'job-restartable' - This job is retained (see section 4.3.7.2) and
is currently able to be restarted using the Restart-Job
operation (see section 3.3.7). If 'job-restartable' is a value
of the job's 'job-state-reasons' attribute, then the IPP object
MUST accept a Restart-Job operation for that job. This value
SHOULD be supported if the Restart-Job operation is supported.
'queued-in-device': The job has been forwarded to a device or
print system that is unable to send back status. The Printer
sets the job's "job-state " attribute to 'completed' and adds
the 'queued-in-device' value to the job's "job-state-reasons"
attribute to indicate that the Printer has no additional
information about the job and never will have any better
information. See section 4.3.7.1.
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This attribute specifies information about the "job-state" and "job-
state-reasons" attributes in human readable text. If the Printer
object supports this attribute, the Printer object MUST be able to
generate this message in any of the natural languages identified by
the Printer's "generated-natural-language-supported" attribute (see
the "attributes-natural-language" operation attribute specified in
Section 3.1.4.1).
The value SHOULD NOT contain additional information not contained in
the values of the "job-state" and "job-states-reasons" attributes,
such as interpreter error information. Otherwise, application
programs might attempt to parse the (localized text). For such
additional information such as interpreter errors for application
program consumption or specific document access errors, new
attributes with keyword values, needs to be developed and registered.
This attribute specifies additional detailed and technical
information about the job. The Printer NEED NOT localize the
message(s), since they are intended for use by the system
administrator or other experienced technical persons. Localization
might obscure the technical meaning of such messages. Clients MUST
NOT attempt to parse the value of this attribute. See "job-
document-access-errors" (section 4.3.11) for additional errors that a
program can process.
This attribute provides additional information about each document
access error for this job encountered by the Printer after it
returned a response to the Print-URI or Send-URI operation and
subsequently attempted to access document(s) supplied in the Print-
URI or Send-URI operation. For errors in the protocol that is
identified by the URI scheme in the "document-uri" operation
attribute, such as 'http:' or 'ftp:', the error code is returned in
parentheses, followed by the URI. For example:
(404) http://ftp.pwg.org/pub/pwg/ipp/new_MOD/ipp-model-v11.pdf
Most Internet protocols use decimal error codes (unlike IPP), so the
ASCII error code representation is in decimal.
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This attribute indicates the number of documents in the job, i.e.,
the number of Send-Document, Send-URI, Print-Job, or Print-URI
operations that the Printer has accepted for this job, regardless of
whether the document data has reached the Printer object or not.
Implementations supporting the OPTIONAL Create-Job/Send-
Document/Send-URI operations SHOULD support this attribute so that
clients can query the number of documents in each job.
This attribute identifies the output device to which the Printer
object has assigned this job. If an output device implements an
embedded Printer object, the Printer object NEED NOT set this
attribute. If a print server implements a Printer object, the value
MAY be empty (zero- length string) or not returned until the Printer
object assigns an output device to the job. This attribute is
particularly useful when a single Printer object supports multiple
devices (so called "fan-out" - see section 2.1).
This section defines the Job Description attributes that indicate the
time at which certain events occur for a job. If the job event has
not yet occurred, then the IPP object MUST return the 'no-value'
out-of-band value (see the beginning of Section 4.1). The "time-at-
xxx(integer)" attributes represent time as an 'integer' representing
the number of seconds since the device was powered up (informally
called "time ticks"). The "date-time-at-xxx(dateTime)" attributes
represent time as 'dateTime' representing date and time (including an
offset from UTC).
In order to populate these attributes, the Printer object copies the
value(s) of the following Printer Description attributes at the time
the event occurs:
1. the value in the Printer's "printer-up-time" attribute for the
"time-at-xxx(integer)" attributes
2. the value in the Printer's "printer-current-time" attribute for
the "date-time-at-xxx(dateTime)" attributes.
If the Printer resets its "printer-up-time" attribute to 1 on power-
up (see section 4.4.29) and has persistent jobs, then it MUST change
all of jobs' "time-at-xxx(integer)" (time tick) job attributes whose
events have occurred either to:
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1. 0 to indicate that the event happened before the most recent
power up OR
2. the negative of the number of seconds before the most recent
power-up that the event took place, though the negative number
NEED NOT reflect the exact number of seconds.
If a client queries a "time-at-xxx(integer)" time tick Job attribute
and finds the value to be 0 or negative, the client MUST assume that
the event occurred in some life other than the Printer's current
life.
Note: A Printer does not change the values of any "date-time-at-
xxx(dateTime)" job attributes on power-up.
This REQUIRED attribute indicates the time at which the Job object
first began processing after the create operation or the most recent
Restart-Job operation. The out-of-band 'no-value' value is returned
if the job has not yet been in the 'processing' state (see the
beginning of Section 4.1).
This REQUIRED attribute indicates the time at which the Job object
completed (or was canceled or aborted). The out-of-band 'no-value'
value is returned if the job has not yet completed, been canceled, or
aborted (see the beginning of Section 4.1).
This REQUIRED Job Description attribute indicates the amount of time
(in seconds) that the Printer implementation has been up and running.
This attribute is an alias for the "printer-up-time" Printer
Description attribute (see Section 4.4.29).
A client MAY request this attribute in a Get-Job-Attributes or Get-
Jobs request and use the value returned in combination with other
requested Event Time Job Description Attributes in order to display
time attributes to a user. The difference between this attribute and
the 'integer' value of a "time-at-xxx" attribute is the number of
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seconds ago that the "time-at-xxx" event occurred. A client can
compute the wall-clock time at which the "time-at-xxx" event occurred
by subtracting this difference from the client's wall-clock time.
This attribute indicates the date and time at which the Job object
first began processing after the create operation or the most recent
Restart-Job operation.
This attribute indicates the number of jobs that are "ahead" of this
job in the relative chronological order of expected time to complete
(i.e., the current scheduled order). For efficiency, it is only
necessary to calculate this value when an operation is performed that
requests this attribute.
This attribute provides a message from an operator, system
administrator or "intelligent" process to indicate to the end user
the reasons for modification or other management action taken on a
job.
This sub-section defines job attributes that describe the size of the
job. These attributes are not intended to be counters; they are
intended to be useful routing and scheduling information if known.
For these attributes, the Printer object may try to compute the value
if it is not supplied in the create request. Even if the client does
supply a value for these three attributes in the create request, the
Printer object MAY choose to change the value if the Printer object
is able to compute a value which is more accurate than the client
supplied value. The Printer object may be able to determine the
correct value for these attributes either right at job submission
time or at any later point in time.
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This attribute specifies the total size of the document(s) in K
octets, i.e., in units of 1024 octets requested to be processed in
the job. The value MUST be rounded up, so that a job between 1 and
1024 octets MUST be indicated as being 1, 1025 to 2048 MUST be 2,
etc.
This value MUST NOT include the multiplicative factors contributed by
the number of copies specified by the "copies" attribute, independent
of whether the device can process multiple copies without making
multiple passes over the job or document data and independent of
whether the output is collated or not. Thus the value is independent
of the implementation and indicates the size of the document(s)
measured in K octets independent of the number of copies.
This value MUST also not include the multiplicative factor due to a
copies instruction embedded in the document data. If the document
data actually includes replications of the document data, this value
will include such replication. In other words, this value is always
the size of the source document data, rather than a measure of the
hardcopy output to be produced.
This attribute specifies the total size in number of impressions of
the document(s) being submitted (see the definition of impression in
section 12.2.5).
As with "job-k-octets", this value MUST NOT include the
multiplicative factors contributed by the number of copies specified
by the "copies" attribute, independent of whether the device can
process multiple copies without making multiple passes over the job
or document data and independent of whether the output is collated or
not. Thus the value is independent of the implementation and
reflects the size of the document(s) measured in impressions
independent of the number of copies.
As with "job-k-octets", this value MUST also not include the
multiplicative factor due to a copies instruction embedded in the
document data. If the document data actually includes replications
of the document data, this value will include such replication. In
other words, this value is always the number of impressions in the
source document data, rather than a measure of the number of
impressions to be produced by the job.
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This attribute specifies the total number of media sheets to be
produced for this job.
Unlike the "job-k-octets" and the "job-impressions" attributes, this
value MUST include the multiplicative factors contributed by the
number of copies specified by the "copies" attribute and a 'number of
copies' instruction embedded in the document data, if any. This
difference allows the system administrator to control the lower and
upper bounds of both (1) the size of the document(s) with "job-k-
octets-supported" and "job-impressions-supported" and (2) the size of
the job with "job-media-sheets-supported".
This sub-section defines job attributes that describe the progress of
the job. These attributes are intended to be counters. That is, the
value for a job that has not started processing MUST be 0. When the
job's "job-state" is 'processing' or 'processing-stopped', this value
is intended to contain the amount of the job that has been processed
to the time at which the attributes are requested. When the job
enters the 'completed', 'canceled', or 'aborted' states, these values
are the final values for the job.
This attribute specifies the total number of octets processed in K
octets, i.e., in units of 1024 octets so far. The value MUST be
rounded up, so that a job between 1 and 1024 octets inclusive MUST be
indicated as being 1, 1025 to 2048 inclusive MUST be 2, etc.
For implementations where multiple copies are produced by the
interpreter with only a single pass over the data, the final value
MUST be equal to the value of the "job-k-octets" attribute. For
implementations where multiple copies are produced by the interpreter
by processing the data for each copy, the final value MUST be a
multiple of the value of the "job-k-octets" attribute.
This job attribute specifies the number of impressions completed for
the job so far. For printing devices, the impressions completed
includes interpreting, marking, and stacking the output.
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This job attribute specifies the media-sheets completed marking and
stacking for the entire job so far whether those sheets have been
processed on one side or on both.
This REQUIRED attribute is populated using the value in the client
supplied "attributes-charset" attribute in the create request. It
identifies the charset (coded character set and encoding method) used
by any Job attributes with attribute syntax 'text' and 'name' that
were supplied by the client in the create request. See Section 3.1.4
for a complete description of the "attributes-charset" operation
attribute.
This attribute does not indicate the charset in which the 'text' and
'name' values are stored internally in the Job object. The internal
charset is implementation-defined. The IPP object MUST convert from
whatever the internal charset is to that being requested in an
operation as specified in Section 3.1.4.
This REQUIRED attribute is populated using the value in the client
supplied "attributes-natural-language" attribute in the create
request. It identifies the natural language used for any Job
attributes with attribute syntax 'text' and 'name' that were supplied
by the client in the create request. See Section 3.1.4 for a
complete description of the "attributes-natural-language" operation
attribute. See Sections 4.1.1.2 and 4.1.2.2 for how a Natural
Language Override may be supplied explicitly for each 'text' and
'name' attribute value that differs from the value identified by the
"attributes-natural-language" attribute.
This REQUIRED Printer attribute contains at least one URI for the
Printer object. It OPTIONALLY contains more than one URI for the
Printer object. An administrator determines a Printer object's
URI(s) and configures this attribute to contain those URIs by some
means outside the scope of this IPP/1.1 document. The precise format
of this URI is implementation dependent and depends on the protocol.
See the next two sections for a description of the "uri-security-
supported" and "uri-authentication-supported" attributes, both of
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which are the REQUIRED companion attributes to this "printer-uri-
supported" attribute. See section 2.4 on Printer object identity and
section 8.2 on security and URIs for more information.
This REQUIRED Printer attribute MUST have the same cardinality
(contain the same number of values) as the "printer-uri-supported"
attribute. This attribute identifies the Client Authentication
mechanism associated with each URI listed in the "printer-uri-
supported" attribute. The Printer object uses the specified mechanism
to identify the authenticated user (see section 8.3). The "i th"
value in "uri-authentication-supported" corresponds to the "i th"
value in "printer-uri-supported" and it describes the authentication
mechanisms used by the Printer when accessed via that URI. See
[RFC2910] for more details on Client Authentication.
The following standard keyword values are defined:
'none': There is no authentication mechanism associated with the
URI. The Printer object assumes that the authenticated user is
"anonymous".
'requesting-user-name': When a client performs an operation whose
target is the associated URI, the Printer object assumes that
the authenticated user is specified by the "requesting-user-
name" Operation attribute (see section 8.3). If the
"requesting-user-name" attribute is absent in a request, the
Printer object assumes that the authenticated user is
"anonymous".
'basic': When a client performs an operation whose target is the
associated URI, the Printer object challenges the client with
HTTP basic authentication [RFC2617]. The Printer object assumes
that the authenticated user is the name received via the basic
authentication mechanism.
'digest': When a client performs an operation whose target is the
associated URI, the Printer object challenges the client with
HTTP digest authentication [RFC2617]. The Printer object
assumes that the authenticated user is the name received via
the digest authentication mechanism.
'certificate': When a client performs an operation whose target is
the associated URI, the Printer object expects the client to
provide a certificate. The Printer object assumes that the
authenticated user is the textual name contained within the
certificate.
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This REQUIRED Printer attribute MUST have the same cardinality
(contain the same number of values) as the "printer-uri-supported"
attribute. This attribute identifies the security mechanisms used
for each URI listed in the "printer-uri-supported" attribute. The "i
th" value in "uri-security-supported" corresponds to the "i th" value
in "printer-uri-supported" and it describes the security mechanisms
used for accessing the Printer object via that URI. See [RFC2910]
for more details on security mechanisms.
The following standard keyword values are defined:
'none': There are no secure communication channel protocols in use
for the given URI.
'ssl3': SSL3 [SSL] is the secure communications channel protocol
in use for the given URI.
'tls': TLS [RFC2246] is the secure communications channel
protocol in use for the given URI.
This attribute is orthogonal to the definition of a Client
Authentication mechanism. Specifically, 'none' does not exclude
Client Authentication. See section 4.4.2.
Consider the following example. For a single Printer object, an
administrator configures the "printer-uri-supported", "uri-
authentication-supported" and "uri-security-supported" attributes as
follows:
"printer-uri-supported": 'xxx://acme.com/open-use-printer',
'xxx://acme.com/restricted-use-printer',
'xxx://acme.com/private-printer'
"uri-authentication-supported": 'none', 'digest', 'basic'
"uri-security-supported": 'none', 'none', 'tls'
Note: 'xxx' is not a valid scheme. See the IPP/1.1 "Transport and
Encoding" document [RFC2910] for the actual URI schemes to be used in
object target attributes.
In this case, one Printer object has three URIs.
- For the first URI, 'xxx://acme.com/open-use-printer', the value
'none' in "uri-security-supported" indicates that there is no
secure channel protocol configured to run under HTTP. The value
of 'none' in "uri-authentication-supported" indicates that all
users are 'anonymous'. There will be no challenge and the
Printer will ignore "requesting-user-name".
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- For the second URI, 'xxx://acme.com/restricted-use-printer', the
value 'none' in "uri-security-supported" indicates that there is
no secure channel protocol configured to run under HTTP. The
value of 'digest' in "uri-authentication-supported" indicates
that the Printer will issue a challenge and that the Printer
will use the name supplied by the digest mechanism to determine
the authenticated user (see section 8.3).
- For the third URI, 'xxx://acme.com/private-printer', the value
'tls' in "uri-security-supported" indicates that TLS is being
used to secure the channel. The client SHOULD be prepared to
use TLS framing to negotiate an acceptable ciphersuite to use
while communicating with the Printer object. In this case, the
name implies the use of a secure communications channel, but the
fact is made explicit by the presence of the 'tls' value in
"uri-security-supported". The client does not need to resort to
understanding which security it must use by following naming
conventions or by parsing the URI to determine which security
mechanisms are implied. The value of 'basic' in "uri-
authentication-supported" indicates that the Printer will issue
a challenge and that the Printer will use the name supplied by
the digest mechanism to determine the authenticated user (see
section 8.3). Because this challenge occurs in a tls session,
the channel is secure.
It is expected that many IPP Printer objects will be configured to
support only one channel (either configured to use TLS access or not)
and only one authentication mechanism. Such Printer objects only have
one URI listed in the "printer-uri-supported" attribute. No matter
the configuration of the Printer object (whether it has only one URI
or more than one URI), a client MUST supply only one URI in the
target "printer-uri" operation attribute.
This REQUIRED Printer attribute contains the name of the Printer
object. It is a name that is more end-user friendly than a URI. An
administrator determines a printer's name and sets this attribute to
that name. This name may be the last part of the printer's URI or it
may be unrelated. In non-US-English locales, a name may contain
characters that are not allowed in a URI.
This Printer attribute identifies the location of the device. This
could include things like: "in Room 123A, second floor of building
XYZ".
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This Printer attribute identifies the descriptive information about
this Printer object. This could include things like: "This printer
can be used for printing color transparencies for HR presentations",
or "Out of courtesy for others, please print only small (1-5 page)
jobs at this printer", or even "This printer is going away on July 1,
1997, please find a new printer".
This Printer attribute contains a URI used to obtain more information
about this specific Printer object. For example, this could be an
HTTP type URI referencing an HTML page accessible to a Web Browser.
The information obtained from this URI is intended for end user
consumption. Features outside the scope of IPP can be accessed from
this URI. The information is intended to be specific to this printer
instance and site specific services (e.g. job pricing, services
offered, end user assistance). The device manufacturer may initially
populate this attribute.
This Printer attribute contains a URI to use to locate the driver
installer for this Printer object. This attribute is intended for
consumption by automata. The mechanics of print driver installation
is outside the scope of this IPP/1.1 document. The device
manufacturer may initially populate this attribute.
This Printer attribute contains a URI used to obtain more information
about this type of device. The information obtained from this URI is
intended for end user consumption. Features outside the scope of IPP
can be accessed from this URI (e.g., latest firmware, upgrades, print
drivers, optional features available, details on color support). The
information is intended to be germane to this printer without regard
to site specific modifications or services. The device manufacturer
may initially populate this attribute.
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This REQUIRED Printer attribute identifies the current state of the
device. The "printer-state reasons" attribute augments the
"printer-state" attribute to give more detailed information about the
Printer in the given printer state.
A Printer object need only update this attribute before responding to
an operation which requests the attribute; the Printer object NEED
NOT update this attribute continually, since asynchronous event
notification is not part of IPP/1.1. A Printer NEED NOT implement
all values if they are not applicable to a given implementation.
The following standard enum values are defined:
Value Symbolic Name and Description
'3' 'idle': Indicates that new jobs can start processing without
waiting.
'4' 'processing': Indicates that jobs are processing; new jobs
will wait before processing.
'5' 'stopped': Indicates that no jobs can be processed and
intervention is required.
Values of "printer-state-reasons", such as 'spool-area-full' and
'stopped-partly', MAY be used to provide further information.
This REQUIRED Printer attribute supplies additional detail about the
device's state. Some of the these value definitions indicate
conformance requirements; the rest are OPTIONAL.
Each keyword value MAY have a suffix to indicate its level of
severity. The three levels are: report (least severe), warning, and
error (most severe).
- '-report': This suffix indicates that the reason is a "report".
An implementation may choose to omit some or all reports. Some
reports specify finer granularity about the printer state;
others serve as a precursor to a warning. A report MUST contain
nothing that could affect the printed output.
- '-warning': This suffix indicates that the reason is a
"warning". An implementation may choose to omit some or all
warnings. Warnings serve as a precursor to an error. A warning
MUST contain nothing that prevents a job from completing, though
in some cases the output may be of lower quality.
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- '-error': This suffix indicates that the reason is an "error".
An implementation MUST include all errors. If this attribute
contains one or more errors, printer MUST be in the stopped
state.
If the implementation does not add any one of the three suffixes, all
parties MUST assume that the reason is an "error".
If a Printer object controls more than one output device, each value
of this attribute MAY apply to one or more of the output devices. An
error on one output device that does not stop the Printer object as a
whole MAY appear as a warning in the Printer's "printer-state-reasons
attribute". If the "printer-state" for such a Printer has a value of
'stopped', then there MUST be an error reason among the values in the
"printer-state-reasons" attribute.
The following standard keyword values are defined:
'other': The device has detected an error other than one listed in
this document.
'none': There are not reasons. This state reason is semantically
equivalent to "printer-state-reasons" without any value and
MUST be used, since the 1setOf attribute syntax requires at
least one value.
'media-needed': A tray has run out of media.
'media-jam': The device has a media jam.
'moving-to-paused': Someone has paused the Printer object using
the Pause-Printer operation (see section 3.2.7) or other means,
but the device(s) are taking an appreciable time to stop.
Later, when all output has stopped, the "printer-state" becomes
'stopped', and the 'paused' value replaces the 'moving-to-
paused' value in the "printer-state-reasons" attribute. This
value MUST be supported, if the Pause-Printer operation is
supported and the implementation takes significant time to
pause a device in certain circumstances.
'paused': Someone has paused the Printer object using the Pause-
Printer operation (see section 3.2.7) or other means and the
Printer object's "printer-state" is 'stopped'. In this state,
a Printer MUST NOT produce printed output, but it MUST perform
other operations requested by a client. If a Printer had been
printing a job when the Printer was paused, the Printer MUST
resume printing that job when the Printer is no longer paused
and leave no evidence in the printed output of such a pause.
This value MUST be supported, if the Pause-Printer operation is
supported.
'shutdown': Someone has removed a Printer object from service, and
the device may be powered down or physically removed. In this
state, a Printer object MUST NOT produce printed output, and
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unless the Printer object is realized by a print server that is
still active, the Printer object MUST perform no other
operations requested by a client, including returning this
value. If a Printer object had been printing a job when it was
shutdown, the Printer NEED NOT resume printing that job when
the Printer is no longer shutdown. If the Printer resumes
printing such a job, it may leave evidence in the printed
output of such a shutdown, e.g. the part printed before the
shutdown may be printed a second time after the shutdown.
'connecting-to-device': The Printer object has scheduled a job on
the output device and is in the process of connecting to a
shared network output device (and might not be able to actually
start printing the job for an arbitrarily long time depending
on the usage of the output device by other servers on the
network).
'timed-out': The server was able to connect to the output device
(or is always connected), but was unable to get a response from
the output device.
'stopping': The Printer object is in the process of stopping the
device and will be stopped in a while. When the device is
stopped, the Printer object will change the Printer object's
state to 'stopped'. The 'stopping-warning' reason is never an
error, even for a Printer with a single output device. When an
output-device ceases accepting jobs, the Printer will have this
reason while the output device completes printing.
'stopped-partly': When a Printer object controls more than one
output device, this reason indicates that one or more output
devices are stopped. If the reason is a report, fewer than
half of the output devices are stopped. If the reason is a
warning, fewer than all of the output devices are stopped.
'toner-low': The device is low on toner.
'toner-empty': The device is out of toner.
'spool-area-full': The limit of persistent storage allocated for
spooling has been reached. The Printer is temporarily unable
to accept more jobs. The Printer will remove this value when
it is able to accept more jobs. This value SHOULD be used by a
non-spooling Printer that only accepts one or a small number
jobs at a time or a spooling Printer that has filled the spool
space.
'cover-open': One or more covers on the device are open.
'interlock-open': One or more interlock devices on the printer are
unlocked.
'door-open': One or more doors on the device are open.
'input-tray-missing': One or more input trays are not in the
device.
'media-low': At least one input tray is low on media.
'media-empty': At least one input tray is empty.
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'output-tray-missing': One or more output trays are not in the
device
'output-area-almost-full': One or more output area is almost full
(e.g. tray, stacker, collator).
'output-area-full': One or more output area is full. (e.g. tray,
stacker, collator)
'marker-supply-low': The device is low on at least one marker
supply. (e.g. toner, ink, ribbon)
'marker-supply-empty: The device is out of at least one marker
supply. (e.g. toner, ink, ribbon)
'marker-waste-almost-full': The device marker supply waste
receptacle is almost full.
'marker-waste-full': The device marker supply waste receptacle is
full.
'fuser-over-temp': The fuser temperature is above normal.
'fuser-under-temp': The fuser temperature is below normal.
'opc-near-eol': The optical photo conductor is near end of life.
'opc-life-over': The optical photo conductor is no longer
functioning.
'developer-low': The device is low on developer.
'developer-empty: The device is out of developer.
'interpreter-resource-unavailable': An interpreter resource is
unavailable (i.e. font, form)
This Printer attribute specifies information about the "printer-
state" and "printer-state-reasons" attributes in human readable text.
If the Printer object supports this attribute, the Printer object
MUST be able to generate this message in any of the natural languages
identified by the Printer's "generated-natural-language-supported"
attribute (see the "attributes-natural-language" operation attribute
specified in Section 3.1.4.1).
This REQUIRED attribute identifies the IPP protocol version(s) that
this Printer supports, including major and minor versions, i.e., the
version numbers for which this Printer implementation meets the
conformance requirements. For version number validation, the Printer
matches the (two-octet binary) "version-number" parameter supplied by
the client in each request (see sections 3.1.1 and 3.1.8) with the
(US-ASCII) keyword values of this attribute.
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The following standard keyword values are defined:
'1.0': Meets the conformance requirement of IPP version 1.0 as
specified in RFC 2566 [RFC2566] and RFC 2565 [RFC2565]
including any extensions registered according to Section 6 and
any extension defined in this version or any future version of
the IPP "Model and Semantics" document or the IPP "Encoding and
Transport" document following the rules, if any, when the
"version-number" parameter is '1.0'.
'1.1': Meets the conformance requirement of IPP version 1.1 as
specified in this document and [RFC2910] including any
extensions registered according to Section 6 and any extension
defined in any future versions of the IPP "Model and Semantics"
document or the IPP Encoding and Transport document following
the rules, if any, when the "version-number" parameter is
'1.1'.
This REQUIRED Printer attribute specifies the set of supported
operations for this Printer object and contained Job objects.
This attribute is encoded as any other enum attribute syntax
according to [RFC2910] as 32-bits. However, all 32-bit enum values
for this attribute MUST NOT exceed 0x00008FFF, since these same
values are also passed in two octets in the "operation-id" parameter
(see section 3.1.1) in each Protocol request with the two high order
octets omitted in order to indicate the operation being performed
[RFC2910].
The following standard enum and "operation-id" (see section 3.1.2)
values are defined:
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Value Operation Name
----------------- -------------------------------------
0x0000 reserved, not used
0x0001 reserved, not used
0x0002 Print-Job
0x0003 Print-URI
0x0004 Validate-Job
0x0005 Create-Job
0x0006 Send-Document
0x0007 Send-URI
0x0008 Cancel-Job
0x0009 Get-Job-Attributes
0x000A Get-Jobs
0x000B Get-Printer-Attributes
0x000C Hold-Job
0x000D Release-Job
0x000E Restart-Job
0x000F reserved for a future operation
0x0010 Pause-Printer
0x0011 Resume-Printer
0x0012 Purge-Jobs
0x0013-0x3FFF reserved for future IETF standards track
operations (see section 6.4)
0x4000-0x8FFF reserved for vendor extensions (see section 6.4)
This Printer attribute indicates whether or not the Printer supports
more than one document per job, i.e., more than one Send-Document or
Send-Data operation with document data. If the Printer supports the
Create-Job and Send-Document operations (see section 3.2.4 and
3.3.1), it MUST support this attribute.
This REQUIRED Printer attribute identifies the charset that the
Printer object has been configured to represent 'text' and 'name'
Printer attributes that are set by the operator, system
administrator, or manufacturer, i.e., for "printer-name" (name),
"printer-location" (text), "printer-info" (text), and "printer-make-
and-model" (text). Therefore, the value of the Printer object's
"charset-configured" attribute MUST also be among the values of the
Printer object's "charset-supported" attribute.
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This REQUIRED Printer attribute identifies the set of charsets that
the Printer and contained Job objects support in attributes with
attribute syntax 'text' and 'name'. At least the value 'utf-8' MUST
be present, since IPP objects MUST support the UTF-8 [RFC2279]
charset. If a Printer object supports a charset, it means that for
all attributes of syntax 'text' and 'name' the IPP object MUST (1)
accept the charset in requests and return the charset in responses as
needed.
If more charsets than UTF-8 are supported, the IPP object MUST
perform charset conversion between the charsets as described in
Section 3.1.4.2.
This REQUIRED Printer attribute identifies the natural language that
the Printer object has been configured to represent 'text' and 'name'
Printer attributes that are set by the operator, system
administrator, or manufacturer, i.e., for "printer-name" (name),
"printer-location" (text), "printer-info" (text), and "printer-make-
and-model" (text). When returning these Printer attributes, the
Printer object MAY return them in the configured natural language
specified by this attribute, instead of the natural language
requested by the client in the "attributes-natural-language"
operation attribute. See Section 3.1.4.1 for the specification of
the OPTIONAL multiple natural language support. Therefore, the value
of the Printer object's "natural-language-configured" attribute MUST
also be among the values of the Printer object's "generated-natural-
language-supported" attribute.
This REQUIRED Printer attribute identifies the natural language(s)
that the Printer object and contained Job objects support in
attributes with attribute syntax 'text' and 'name'. The natural
language(s) supported depends on implementation and/or configuration.
Unlike charsets, IPP objects MUST accept requests with any natural
language or any Natural Language Override whether the natural
language is supported or not.
If a Printer object supports a natural language, it means that for
any of the attributes for which the Printer or Job object generates
messages, i.e., for the "job-state-message" and "printer-state-
message" attributes and Operation Messages (see Section 3.1.5) in
operation responses, the Printer and Job objects MUST be able to
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generate messages in any of the Printer's supported natural
languages. See section 3.1.4 for the definition of 'text' and 'name'
attributes in operation requests and responses.
Note: A Printer object that supports multiple natural languages,
often has separate catalogs of messages, one for each natural
language supported.
This REQUIRED Printer attribute identifies the document format that
the Printer object has been configured to assume if the client does
not supply a "document-format" operation attribute in any of the
operation requests that supply document data. The standard values
for this attribute are Internet Media types (sometimes called MIME
types). For further details see the description of the
'mimeMediaType' attribute syntax in Section 4.1.9.
This REQUIRED Printer attribute identifies the set of document
formats that the Printer object and contained Job objects can
support. For further details see the description of the
'mimeMediaType' attribute syntax in Section 4.1.9.
This REQUIRED Printer attribute indicates whether the printer is
currently able to accept jobs, i.e., is accepting Print-Job, Print-
URI, and Create-Job requests. If the value is 'true', the printer is
accepting jobs. If the value is 'false', the Printer object is
currently rejecting any jobs submitted to it. In this case, the
Printer object returns the 'server-error-not-accepting-jobs' status
code.
This value is independent of the "printer-state" and "printer-state-
reasons" attributes because its value does not affect the current
job; rather it affects future jobs. This attribute, when 'false',
causes the Printer to reject jobs even when the "printer-state" is
'idle' or, when 'true', causes the Printer object to accepts jobs
even when the "printer-state" is 'stopped'.
This REQUIRED Printer attribute contains a count of the number of
jobs that are either 'pending', 'processing', 'pending-held', or
'processing-stopped' and is set by the Printer object.
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This Printer attribute provides a message from an operator, system
administrator or "intelligent" process to indicate to the end user
information or status of the printer, such as why it is unavailable
or when it is expected to be available.
This Printer attribute identifies whether the device is capable of
any type of color printing at all, including highlight color. All
document instructions having to do with color are embedded within the
document PDL (none are external IPP attributes in IPP/1.1).
Note: end-users are able to determine the nature and details of the
color support by querying the "printer-more-info-manufacturer"
Printer attribute.
This Printer attribute specifies which URI schemes are supported for
use in the "document-uri" operation attribute of the Print-URI or
Send-URI operation. If a Printer object supports these optional
operations, it MUST support the "reference-uri-schemes-supported"
Printer attribute with at least the following schemed URI value:
'ftp': The Printer object will use an FTP 'get' operation as
defined in RFC 2228 [RFC2228] using FTP URLs as defined by
[RFC2396] and [RFC2316].
The Printer object MAY OPTIONALLY support other URI schemes (see
section 4.1.6).
This REQUIRED Printer attribute expresses the ability for a
particular Printer implementation to either attempt to override
document data instructions with IPP attributes or not.
This attribute takes on the following keyword values:
- 'attempted': This value indicates that the Printer object
attempts to make the IPP attribute values take precedence over
embedded instructions in the document data, however there is no
guarantee.
- 'not-attempted': This value indicates that the Printer object
makes no attempt to make the IPP attribute values take
precedence over embedded instructions in the document data.
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Section 15 contains a full description of how this attribute
interacts with and affects other IPP attributes, especially the
"ipp-attribute-fidelity" attribute.
This REQUIRED Printer attribute indicates the amount of time (in
seconds) that this Printer instance has been up and running. The
value is a monotonically increasing value starting from 1 when the
Printer object is started-up (initialized, booted, etc.). This value
is used to populate the Event Time Job Description Job attributes
"time-at-creation", "time-at-processing", and "time-at-completed"
(see section 4.3.14).
If the Printer object goes down at some value 'n', and comes back up,
the implementation MAY:
1. Know how long it has been down, and resume at some value
greater than 'n', or
2. Restart from 1.
In other words, if the device or devices that the Printer object is
representing are restarted or power cycled, the Printer object MAY
continue counting this value or MAY reset this value to 1 depending
on implementation. However, if the Printer object software ceases
running, and restarts without knowing the last value for "printer-
up-time", the implementation MUST reset this value to 1. If this
value is reset and the Printer has persistent jobs, the Printer MUST
reset the "time-at-xxx(integer) Event Time Job Description attributes
according to Section 4.3.14. An implementation MAY use both
implementation alternatives, depending on warm versus cold start,
respectively.
This Printer attribute indicates the current date and time. This
value is used to populate the Event Time Job Description attributes:
"date-time-at-creation", "date-time-at-processing", and "date-time-
at-completed" (see Section 4.3.14).
The date and time is obtained on a "best efforts basis" and does not
have to be that precise in order to work in practice. A Printer
implementation sets the value of this attribute by obtaining the date
and time via some implementation-dependent means, such as getting the
value from a network time server, initialization at time of
manufacture, or setting by an administrator. See [IPP-IIG] for
examples. If an implementation supports this attribute and the
implementation knows that it has not yet been set, then the
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implementation MUST return the value of this attribute using the
out-of-band 'no-value' meaning not configured. See the beginning of
section 4.1.
The time zone of this attribute NEED NOT be the time zone used by
people located near the Printer object or device. The client MUST
NOT expect that the time zone of any received 'dateTime' value to be
in the time zone of the client or in the time zone of the people
located near the printer.
The client SHOULD display any dateTime attributes to the user in
client local time by converting the 'dateTime' value returned by the
server to the time zone of the client, rather than using the time
zone returned by the Printer in attributes that use the 'dateTime'
attribute syntax.
This Printer attributes identifies the minimum time (in seconds) that
the Printer object waits for additional Send-Document or Send-URI
operations to follow a still-open Job object before taking any
recovery actions, such as the ones indicated in section 3.3.1. If
the Printer object supports the Create-Job and Send-Document
operations (see section 3.2.4 and 3.3.1), it MUST support this
attribute.
It is RECOMMENDED that vendors supply a value for this attribute that
is between 60 and 240 seconds. An implementation MAY allow a system
administrator to set this attribute (by means outside this IPP/1.1
document). If so, the system administrator MAY be able to set values
outside this range.
This REQUIRED Printer attribute identifies the set of supported
compression algorithms for document data. Compression only applies
to the document data; compression does not apply to the encoding of
the IPP operation itself. The supported values are used to validate
the client supplied "compression" operation attributes in Print-Job,
Send-Document, and Send-URI requests.
Standard keyword values are :
'none': no compression is used.
'deflate': ZIP public domain inflate/deflate) compression technology
in RFC 1951 [RFC1951]
'gzip' GNU zip compression technology described in RFC 1952
[RFC1952].
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'compress': UNIX compression technology in RFC 1977 [RFC1977]
This Printer attribute specifies the upper and lower bounds of total
sizes of jobs in K octets, i.e., in units of 1024 octets. The
supported values are used to validate the client supplied "job-k-
octets" operation attributes in create requests. The corresponding
job description attribute "job-k-octets" is defined in section
4.3.17.1.
This Printer attribute specifies the upper and lower bounds for the
number of impressions per job. The supported values are used to
validate the client supplied "job-impressions" operation attributes
in create requests. The corresponding job description attribute
"job-impressions" is defined in section 4.3.17.2.
This Printer attribute specifies the upper and lower bounds for the
number of media sheets per job. The supported values are used to
validate the client supplied "job-media-sheets" operation attributes
in create requests. The corresponding Job attribute "job-media-
sheets" is defined in section 4.3.17.3.
This Printer attributes specifies the nominal number of pages per
minute to the nearest whole number which may be generated by this
printer (e.g., simplex, black-and-white). This attribute is
informative, not a service guarantee. Generally, it is the value
used in the marketing literature to describe the device.
A value of 0 indicates a device that takes more than two minutes to
process a page.
This Printer attributes specifies the nominal number of pages per
minute to the nearest whole number which may be generated by this
printer when printing color (e.g., simplex, color). For purposes of
this attribute, "color" means the same as for the "color-supported"
attribute, namely, the device is capable of any type of color
printing at all, including highlight color. This attribute is
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informative, not a service guarantee. Generally, it is the value
used in the marketing literature to describe the color capabilities
of this device.
A value of 0 indicates a device that takes more than two minutes to
process a page.
If a color device has several color modes, it MAY use the pages-per-
minute value for this attribute that corresponds to the mode that
produces the highest number.
Black and white only printers MUST NOT support this attribute. If
this attribute is present, then the "color-supported" Printer
description attribute MUST be present and have a 'true' value.
The values of these two attributes returned by the Get-Printer-
Attributes operation MAY be affected by the "document-format"
attribute supplied by the client in the Get-Printer-Attributes
request. In other words, the implementation MAY have different
speeds depending on the document format being processed. See section
3.2.5.1 Get-Printer-Attributes.
This section describes conformance issues and requirements. This
document introduces model entities such as objects, operations,
attributes, attribute syntaxes, and attribute values. These
conformance sections describe the conformance requirements which
apply to these model entities.
This section describes the conformance requirements for a client (see
section 2.1), whether it be:
1. contained within software controlled by an end user, e.g.
activated by the "Print" menu item in an application that sends
IPP requests or
2. the print server component that sends IPP requests to either an
output device or another "downstream" print server.
A conforming client MUST support all REQUIRED operations as defined
in this document. For each attribute included in an operation
request, a conforming client MUST supply a value whose type and value
syntax conforms to the requirements of the Model document as
specified in Sections 3 and 4. A conforming client MAY supply any
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IETF standards track extensions and/or vendor extensions in an
operation request, as long as the extensions meet the requirements in
Section 6.
Otherwise, there are no conformance requirements placed on the user
interfaces provided by IPP clients or their applications. For
example, one application might not allow an end user to submit
multiple documents per job, while another does. One application
might first query a Printer object in order to supply a graphical
user interface (GUI) dialogue box with supported and default values
whereas a different implementation might not.
When sending a request, an IPP client NEED NOT supply any attributes
that are indicated as OPTIONALLY supplied by the client.
A client MUST be able to accept any of the attribute syntaxes defined
in Section 4.1, including their full range, that may be returned to
it in a response from a Printer object. In particular for each
attribute that the client supports whose attribute syntax is 'text',
the client MUST accept and process both the 'textWithoutLanguage' and
'textWithLanguage' forms. Similarly, for each attribute that the
client supports whose attribute syntax is 'name', the client MUST
accept and process both the 'nameWithoutLanguage' and
'nameWithLanguage' forms. For presentation purposes, truncation of
long attribute values is not recommended. A recommended approach
would be for the client implementation to allow the user to scroll
through long attribute values.
A response MAY contain attribute groups, attributes, attribute
syntaxes, values, and status codes that the client does not expect.
Therefore, a client implementation MUST gracefully handle such
responses and not refuse to inter-operate with a conforming Printer
that is returning IETF standards track extension or vendor
extensions, including attribute groups, attributes, attribute
syntaxes, attribute values, status codes, and out-of-band attribute
values that conform to Section 6. Clients may choose to ignore any
parameters, attribute groups, attributes, attribute syntaxes, or
values that they do not understand.
While a client is sending data to a printer, it SHOULD do its best to
prevent a channel from being closed by a lower layer when the channel
is blocked (i.e. flow-controlled off) for whatever reason, e.g. 'out
of paper' or 'job ahead hasn't freed up enough memory'. However, the
layer that launched the print submission (e.g. an end user) MAY close
the channel in order to cancel the job. When a client closes a
channel, a Printer MAY print all or part of the received portion of
the document. See the "Encoding and Transport" document [RFC2910]
for more details.
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A client MUST support Client Authentication as defined in the IPP/1.1
Encoding and Transport document [RFC2910]. A client SHOULD support
Operation Privacy and Server Authentication as defined in the IPP/1.1
Encoding and Transport document [RFC2910]. See also section 8 of
this document.
This section specifies the conformance requirements for conforming
implementations of IPP objects (see section 2). These requirements
apply to an IPP object whether it is:
(1) an (embedded) device component that accepts IPP requests and
controls the device or
(2) a component of a print server that accepts IPP requests (where
the print server control one or more networked devices using IPP or
other protocols).
Conforming implementations MUST implement all of the model objects as
defined in this document in the indicated sections:
Section 2.1 - Printer Object
Section 2.2 - Job Object
Conforming IPP object implementations MUST implement all of the
REQUIRED model operations, including REQUIRED responses, as defined
in this document in the indicated sections:
For a Printer object:
Print-Job (section 3.2.1) REQUIRED
Print-URI (section 3.2.2) OPTIONAL
Validate-Job (section 3.2.3) REQUIRED
Create-Job (section 3.2.4) OPTIONAL
Get-Printer-Attributes (section 3.2.5) REQUIRED
Get-Jobs (section 3.2.6) REQUIRED
Pause-Printer (section 3.2.7) OPTIONAL
Resume-Printer (section 3.2.8) OPTIONAL
Purge-Jobs (section 3.2.9) OPTIONAL
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For a Job object:
Send-Document (section 3.3.1) OPTIONAL
Send-URI (section 3.3.2) OPTIONAL
Cancel-Job (section 3.3.3) REQUIRED
Get-Job-Attributes (section 3.3.4) REQUIRED
Hold-Job (section 3.3.5) OPTIONAL
Release-Job (section 3.3.6) OPTIONAL
Restart-Job (section 3.3.7) OPTIONAL
Conforming IPP objects MUST support all REQUIRED operation attributes
and all values of such attributes if so indicated in the description.
Conforming IPP objects MUST ignore all unsupported or unknown
operation attributes or operation attribute groups received in a
request, but MUST reject a request that contains a supported
operation attribute that contains an unsupported value.
Conforming IPP objects MAY return operation responses that contain
attributes groups, attributes names, attribute syntaxes, attribute
values, and status codes that are extensions to this standard. The
additional attribute groups MAY occur in any order.
The following section on object attributes specifies the support
required for object attributes.
Conforming IPP objects MUST support all of the REQUIRED object
attributes, as defined in this document in the indicated sections.
If an object supports an attribute, it MUST support only those values
specified in this document or through the extension mechanism
described in section 5.2.4. It MAY support any non-empty subset of
these values. That is, it MUST support at least one of the specified
values and at most all of them.
IPP/1.1 clients MUST meet the conformance requirements for clients
specified in this document and [RFC2910]. IPP/1.1 clients MUST send
requests containing a "version-number" parameter with a '1.1' value.
IPP/1.1 Printer and Job objects MUST meet the conformance
requirements for IPP objects specified in this document and
[RFC2910]. IPP/1.1 objects MUST accept requests containing a
"version-number" parameter with a '1.1' value (or reject the request
if the operation is not supported).
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It is beyond the scope of this specification to mandate conformance
with previous versions. IPP/1.1 was deliberately designed, however,
to make supporting previous versions easy. It is worth noting that,
at the time of composing this specification (1999), we would expect
IPP/1.1 Printer implementations to:
understand any valid request in the format of IPP/1.0, or 1.1;
respond appropriately with a response containing the same
"version-number" parameter value used by the client in the request.
And we would expect IPP/1.1 clients to:
understand any valid response in the format of IPP/1.0, or 1.1.
It is recommended that IPP/1.1 clients try supplying alternate
version numbers if they receive a 'server-error-version-not-
supported' error return in a response.
A conforming IPP object MAY support IETF standards track extensions
and vendor extensions, as long as the extensions meet the
requirements specified in Section 6.
For each attribute included in an operation response, a conforming
IPP object MUST return a value whose type and value syntax conforms
to the requirement of the Model document as specified in Sections 3
and 4.
An IPP object MUST be able to accept any of the attribute syntaxes
defined in Section 4.1, including their full range, in any operation
in which a client may supply attributes or the system administrator
may configure attributes (by means outside the scope of this IPP/1.1
document). In particular for each attribute that the IPP object
supports whose attribute syntax is 'text', the IPP object MUST accept
and process both the 'textWithoutLanguage' and 'textWithLanguage'
forms. Similarly, for each attribute that the IPP object supports
whose attribute syntax is 'name', the IPP object MUST accept and
process both the 'nameWithoutLanguage' and 'nameWithLanguage' forms.
Furthermore, an IPP object MUST return attributes to the client in
operation responses that conform to the syntax specified in Section
4.1, including their full range if supplied previously by a client.
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An IPP Printer implementation SHOULD contain support for Client
Authentication as defined in the IPP/1.1 Encoding and Transport
document [RFC2910]. A Printer implementation MAY allow an
administrator to configure the Printer so that all, some, or none of
the users are authenticated. See also section 8 of this document.
An IPP Printer implementation SHOULD contain support for Operation
Privacy and Server Authentication as defined in the IPP/1.1 Encoding
and Transport document [RFC2910]. A Printer implementation MAY allow
an administrator to configure the degree of support for Operation
Privacy and Server Authentication. See also section 8 of this
document.
Security MUST NOT be compromised when a client supplies a lower
"version-number" parameter in a request. For example, if an IPP/1.1
conforming Printer object accepts version '1.0' requests and is
configured to enforce Digest Authentication, it MUST do the same for
a version '1.0' request.
All clients and IPP objects MUST support the 'utf-8' charset as
defined in section 4.1.7.
IPP objects MUST be able to accept any client request which correctly
uses the "attributes-natural-language" operation attribute or the
Natural Language Override mechanism on any individual attribute
whether or not the natural language is supported by the IPP object.
If an IPP object supports a natural language, then it MUST be able to
translate (perhaps by table lookup) all generated 'text' or 'name'
attribute values into one of the supported languages (see section
3.1.4). That is, the IPP object that supports a natural language
NEED NOT be a general purpose translator of any arbitrary 'text' or
'name' value supplied by the client into that natural language.
However, the object MUST be able to translate (automatically
generate) any of its own attribute values and messages into that
natural language.
This section describes the procedures for defining semantics for the
following IETF standards track extensions and vendor extensions to
the IPP/1.1 Model and Semantics document:
1. keyword attribute values
2. enum attribute values
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3. attributes
4. attribute syntaxes
5. operations
6. attribute groups
7. status codes
8. out-of-band attribute values
Extensions registered for use with IPP/1.1 are OPTIONAL for client
and IPP object conformance to the IPP/1.1 "Model and Semantics"
document (this document).
These extension procedures are aligned with the guidelines as set
forth by the IESG [IANA-CON]. Section 11 describes how to propose
new registrations for consideration. IANA will reject registration
proposals that leave out required information or do not follow the
appropriate format described in Section 11. The IPP/1.1 Model and
Semantics document may also be extended by an appropriate RFC that
specifies any of the above extensions.
IPP allows for 'keyword' and 'enum' extensions (see sections 4.1.2.3
and 4.1.4). This document uses prefixes to the 'keyword' and 'enum'
basic attribute syntax type in order to communicate extra information
to the reader through its name. This extra information is not
represented in the protocol because it is unimportant to a client or
Printer object. The list below describes the prefixes and their
meaning.
"type1": This IPP specification document must be revised (or
another IETF standards track document which augments this
document) to add a new keyword or a new enum. No vendor
defined keywords or enums are allowed.
"type2": Implementers can, at any time, add new keyword or enum
values by proposing the complete specification to IANA:
iana@iana.org
IANA will forward the registration proposal to the IPP
Designated Expert who will review the proposal with a mailing
list that the Designated Expert keeps for this purpose.
Initially, that list will be the mailing list used by the IPP
WG:
ipp@pwg.org
even after the IPP WG is disbanded as permitted by [IANA-CON].
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The IPP Designated Expert is appointed by the IESG Area
Director responsible for IPP, according to [IANA-CON].
When a type2 keyword or enum is approved, the IPP Designated
Expert becomes the point of contact for any future maintenance
that might be required for that registration.
"type3": Implementers can, at any time, add new keyword and enum
values by submitting the complete specification to IANA as for
type2 who will forward the proposal to the IPP Designated
Expert. While no additional technical review is required, the
IPP Designated Expert may, at his/her discretion, forward the
proposal to the same mailing list as for type2 registrations
for advice and comment.
When a type3 keyword or enum is approved by the IPP Designated
Expert, the original proposer becomes the point of contact for
any future maintenance that might be required for that
registration.
For type2 and type3 keywords, the proposer includes the name of the
keyword in the registration proposal and the name is part of the
technical review.
After type2 and type3 enums specifications are approved, the IPP
Designated Expert in consultation with IANA assigns the next
available enum number for each enum value.
IANA will publish approved type2 and type3 keyword and enum
attributes value registration specifications in:
ftp.isi.edu/iana/assignments/ipp/attribute-values/xxx/yyy.txt
where xxx is the attribute name that specifies the initial values and
yyy.txt is a descriptive file name that contains one or more enums or
keywords approved at the same time. For example, if several
additional enums for stapling are approved for use with the
"finishings" attribute (and "finishings-default" and "finishings-
supported" attributes), IANA will publish the additional values in
the file:
ftp.isi.edu/iana/assignments/ipp/attribute-
values/finishings/stapling.txt
Note: Some attributes are defined to be: 'type3 keywords' | 'name'
which allows for attribute values to be extended by a site
administrator with administrator defined names. Such names are not
registered with IANA.
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By definition, each of the three types above assert some sort of
registry or review process in order for extensions to be considered
valid. Each higher numbered level (1, 2, 3) tends to be decreasingly
less stringent than the previous level. Therefore, any typeN value
MAY be registered using a process for some typeM where M is less than
N, however such registration is NOT REQUIRED. For example, a type3
value MAY be registered in a type 1 manner (by being included in a
future version of an IPP specification), however, it is NOT REQUIRED.
This document defines keyword and enum values for all of the above
types, including type3 keywords.
For vendor keyword extensions, implementers SHOULD use keywords with
a suitable distinguishing prefix, such as "xxx-" where xxx follows
the syntax rules for keywords (see section 4.1.3) and is the
(lowercase) fully qualified company name registered with IANA for use
in domain names [RFC1035]. For example, if the company XYZ Corp. had
obtained the domain name "XYZ.com", then a vendor keyword 'abc' would
be: 'xyz.com-abc'.
Note: RFC 1035 [RFC1035] indicates that while upper and lower case
letters are allowed in domain names, no significance is attached to
the case. That is, two names with the same spelling but different
case are to be treated as if identical. Also, the labels in a domain
name must follow the rules for ARPANET host names: They must start
with a letter, end with a letter or digit, and have as interior
characters only letters, digits, and hyphen. Labels must be 63
characters or less. Labels are separated by the "." character.
For vendor enum extensions, implementers MUST use values in the
reserved integer range which is 2**30 to 2**31-1.
Attribute names (see section 4.1.3) are type2 keywords. Therefore,
new attributes may be registered and have the same status as
attributes in this document by following the type2 extension rules.
For vendor attribute extensions, implementers SHOULD use keywords
with a suitable distinguishing prefix as described in Section 6.1.
IANA will publish approved attribute registration specifications as
separate files:
ftp.isi.edu/iana/assignments/ipp/attributes/xxx-yyy.txt
where "xxx-yyy" is the new attribute name.
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If a new Printer object attribute is defined and its values can be
affected by a specific document format, its specification needs to
contain the following sentence:
"The value of this attribute returned in a Get-Printer-
Attributes response MAY depend on the "document-format"
attribute supplied (see Section 3.2.5.1)."
If the specification does not, then its value in the Get-Printer-
Attributes response MUST NOT depend on the "document-format" supplied
in the request. When a new Job Template attribute is registered, the
value of the Printer attributes MAY vary with "document-format"
supplied in the request without the specification having to indicate
so.
Attribute syntaxes (see section 4.1) are like type2 enums.
Therefore, new attribute syntaxes may be registered and have the same
status as attribute syntaxes in this document by following the type2
extension rules described in Section 6.1. The initial set of value
codes that identify each of the attribute syntaxes have been assigned
in the "Encoding and Transport" document [RFC2910], including a
designated range for vendor extension.
For attribute syntaxes, the IPP Designated Expert in consultation
with IANA assigns the next attribute syntax code in the appropriate
range as specified in [RFC2910]. IANA will publish approved
attribute syntax registration specifications as separate files:
ftp.isi.edu/iana/assignments/ipp/attribute-syntaxes/xxx-yyy.txt
where 'xxx-yyy' is the new attribute syntax name.
Operations (see section 3) may also be registered following the type2
procedures described in Section 6.1, though major new operations will
usually be done by a new standards track RFC that augments this
document. For vendor operation extensions, implementers MUST use the
range for the "operation-id" in requests specified in Section 4.4.15
"operations-supported" Printer attribute.
For operations, the IPP Designated Expert in consultation with IANA
assigns the next operation-id code as specified in Section 4.4.15.
IANA will publish approved operation registration specifications as
separate files:
Hastings, et al. Standards Track [Page 152]
RFC 2911 IPP/1.1: Model and Semantics September 2000
ftp.isi.edu/iana/assignments/ipp/operations/Xxx-Yyy.txt
where "Xxx-Yyy" is the new operation name.
Attribute groups (see section 3.1.3) passed in requests and responses
may be registered following the type2 procedures described in Section
6.1. The initial set of attribute group tags have been assigned in
the "Encoding and Transport" document [RFC2910], including a
designated range for vendor extension.
For attribute groups, the IPP Designated Expert in consultation with
IANA assigns the next attribute group tag code in the appropriate
range as specified in [RFC2910]. IANA will publish approved
attribute group registration specifications as separate files:
ftp.isi.edu/iana/assignments/ipp/attribute-group-tags/xxx-yyy-
tag.txt
where 'xxx-yyy-tag' is the new attribute group tag name.
Operation status codes (see section 3.1.6.1) may also be registered
following the type2 procedures described in Section 6.1. The values
for status codes are allocated in ranges as specified in Section 14
for each status code class:
"informational" - Request received, continuing process
"successful" - The action was successfully received, understood, and
accepted
"redirection" - Further action must be taken in order to complete the
request
"client-error" - The request contains bad syntax or cannot be
fulfilled
"server-error" - The IPP object failed to fulfill an apparently
valid request
For vendor operation status code extensions, implementers MUST use
the top of each range as specified in Section 13.
For operation status codes, the IPP Designated Expert in consultation
with IANA assigns the next status code in the appropriate class range
as specified in Section 13. IANA will publish approved status code
registration specifications as separate files:
ftp.isi.edu/iana/assignments/ipp/status-codes/xxx-yyy.txt
Hastings, et al. Standards Track [Page 153]
RFC 2911 IPP/1.1: Model and Semantics September 2000
where "xxx-yyy" is the new operation status code keyword.
Out-of-band attribute values (see the beginning of section 4.1)
passed in requests and responses may be registered following the
type2 procedures described in Section 6.1. The initial set of out-
of-band attribute value tags have been assigned in the "Encoding and
Transport" document [RFC2910].
For out-of-band attribute value tags, the IPP Designated Expert in
consultation with IANA assigns the next out-of-band attribute value
tag code in the appropriate range as specified in [RFC2910]. IANA
will publish approved out-of-band attribute value tags registration
specifications as separate files:
ftp.isi.edu/iana/assignments/ipp/out-of-band-attribute-value-
tags/xxx-yyy-tag.txt
where 'xxx-yyy-tag' is the new out-of-band attribute value tag name.
The "document-format" attribute's syntax is 'mimeMediaType'. This
means that valid values are Internet Media Types (see Section 4.1.9).
RFC 2045 [RFC2045] defines the syntax for valid Internet media types.
IANA is the registry for all Internet media types.
The "attributes-charset" attribute's syntax is 'charset'. This means
that valid values are charsets names. When a charset in the IANA
registry has more than one name (alias), the name labeled as
"(preferred MIME name)", if present, MUST be used (see Section
4.1.7). IANA is the registry for charsets following the procedures
of [RFC2278].
Some of the attributes have values that are text strings and names
which are intended for human understanding rather than machine
understanding (see the 'text' and 'name' attribute syntaxes in
Sections 4.1.1 and 4.1.2).
In each operation request, the client
- identifies the charset and natural language of the request which
affects each supplied 'text' and 'name' attribute value, and
Hastings, et al. Standards Track [Page 154]
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- requests the charset and natural language for attributes
returned by the IPP object in operation responses (as described
in Section 3.1.4.1).
In addition, the client MAY separately and individually identify the
Natural Language Override of a supplied 'text' or 'name' attribute
using the 'textWithLanguage' and 'nameWithLanguage' technique
described section 4.1.1.2 and 4.1.2.2 respectively.
All IPP objects MUST support the UTF-8 [RFC2279] charset in all
'text' and 'name' attributes supported. If an IPP object supports
more than the UTF-8 charset, the object MUST convert between them in
order to return the requested charset to the client according to
Section 3.1.4.2. If an IPP object supports more than one natural
language, the object SHOULD return 'text' and 'name' values in the
natural language requested where those values are generated by the
Printer (see Section 3.1.4.1).
For Printers that support multiple charsets and/or multiple natural
languages in 'text' and 'name' attributes, different jobs may have
been submitted in differing charsets and/or natural languages. All
responses MUST be returned in the charset requested by the client.
However, the Get-Jobs operation uses the 'textWithLanguage' and
'nameWithLanguage' mechanism to identify the differing natural
languages with each job attribute returned.
The Printer object also has configured charset and natural language
attributes. The client can query the Printer object to determine
the list of charsets and natural languages supported by the Printer
object and what the Printer object's configured values are. See the
"charset-configured", "charset-supported", "natural-language-
configured", and "generated-natural-language-supported" Printer
description attributes for more details.
The "charset-supported" attributed identifies the supported charsets.
If a charset is supported, the IPP object MUST be capable of
converting to and from that charset into any other supported charset.
In many cases, an IPP object will support only one charset and it
MUST be the UTF-8 charset.
The "charset-configured" attribute identifies the one supported
charset which is the native charset given the current configuration
of the IPP object (administrator defined).
The "generated-natural-language-supported" attribute identifies the
set of supported natural languages for generated messages; it is not
related to the set of natural languages that must be accepted for
client supplied 'text' and 'name' attributes. For client supplied
Hastings, et al. Standards Track [Page 155]
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'text' and 'name' attributes, an IPP object MUST accept ALL supplied
natural languages. Just because a Printer object is currently
configured to support 'en-us' natural language does not mean that the
Printer object should reject a job if the client supplies a job name
that is in 'fr-ca'.
The "natural-language-configured" attribute identifies the one
supported natural language for generated messages which is the native
natural language given the current configuration of the IPP object
(administrator defined).
Attributes of type 'text' and 'name' are populated from different
sources. These attributes can be categorized into following groups
(depending on the source of the attribute):
1. Some attributes are supplied by the client (e.g., the client
supplied "job-name", "document-name", and "requesting-user-
name" operation attributes along with the corresponding Job
object's "job-name" and "job-originating-user-name"
attributes). The IPP object MUST accept these attributes in
any natural language no matter what the set of supported
languages for generated messages
2. Some attributes are supplied by the system administrator (e.g.,
the Printer object's "printer-name" and "printer-location"
attributes). These too can be in any natural language. If the
natural language for these attributes is different than what a
client requests, then they must be reported using the Natural
Language Override mechanism.
3. Some attributes are supplied by the device manufacturer (e.g.,
the Printer object's "printer-make-and-model" attribute).
These too can be in any natural language. If the natural
language for these attributes is different than what a client
requests, then they must be reported using the Natural Language
Override mechanism.
4. Some attributes are supplied by the operator (e.g., the Job
object's "job-message-from-operator" attribute). These too can
be in any natural language. If the natural language for these
attributes is different than what a client requests, then they
must be reported using the Natural Language Override mechanism.
5. Some attributes are generated by the IPP object (e.g., the Job
object's "job-state-message" attribute, the Printer object's
"printer-state-message" attribute, and the "status-message"
operation attribute). These attributes can only be in one of
the "generated-natural-language-supported" natural languages.
If a client requests some natural language for these attributes
other than one of the supported values, the IPP object SHOULD
Hastings, et al. Standards Track [Page 156]
RFC 2911 IPP/1.1: Model and Semantics September 2000
respond using the value of the "natural-language-configured"
attribute (using the Natural Language Override mechanism if
needed).
The 'text' and 'name' attributes specified in this version of this
document (additional ones will be registered according to the
procedures in Section 6) are:
Attributes Source
Operation Attributes:
job-name (name) client
document-name (name) client
requesting-user-name (name) client
status-message (text) Job or Printer object
detailed-status-message (text) Job or Printer object -
see rule 1
document-access-error (text) Job or Printer object -
see rule 1
Job Template Attributes:
job-hold-until (keyword | name) client matches
administrator-configured
job-hold-until-default (keyword | name) client matches
administrator-configured
job-hold-until-supported (keyword | client matches
name) administrator-configured
job-sheets (keyword | name) client matches
administrator-configured
job-sheets-default (keyword | name) client matches
administrator-configured
job-sheets-supported (keyword | name) client matches
administrator-configured
media (keyword | name) client matches
administrator-configured
media-default (keyword | name) client matches
administrator-configured
media-supported (keyword | name) client matches
administrator-configured
media-ready (keyword | name) client matches
administrator-configured
Job Description Attributes:
job-name (name) client or Printer object
job-originating-user-name (name) Printer object
job-state-message (text) Job or Printer object
output-device-assigned (name(127)) administrator
job-message-from-operator (text(127)) operator
Hastings, et al. Standards Track [Page 157]
RFC 2911 IPP/1.1: Model and Semantics September 2000
job-detailed-status-messages (1setOf Job or Printer object -
text) see rule 1
job-document-access-errors (1setOf Job or Printer object -
text) see rule 1
Printer Description Attributes:
printer-name (name(127)) administrator
printer-location (text(127)) administrator
printer-info (text(127)) administrator
printer-make-and-model (text(127)) administrator or
manufacturer
printer-state-message (text) Printer object
printer-message-from-operator operator
(text(127))
Rule 1 - Neither the Printer nor the client localizes these message
attributes, since they are intended for use by the system
administrator or other experienced technical persons.
It is difficult to anticipate the security risks that might exist in
any given IPP environment. For example, if IPP is used within a given
corporation over a private network, the risks of exposing document
data may be low enough that the corporation will choose not to use
encryption on that data. However, if the connection between the
client and the IPP object is over a public network, the client may
wish to protect the content of the information during transmission
through the network with encryption.
Furthermore, the value of the information being printed may vary from
one IPP environment to the next. Printing payroll checks, for
example, would have a different value than printing public
information from a file. There is also the possibly of denial-of-
service attacks, but denial-of-service attacks against printing
resources are not well understood and there is no published
precedents regarding this scenario.
Once the authenticated identity of the requester has been supplied to
the IPP object, the object uses that identity to enforce any
authorization policy that might be in place. For example, one site's
policy might be that only the job owner is allowed to cancel a job.
The details and mechanisms to set up a particular access control
policy are not part of IPP/1.1, and must be established via some
other type of administrative or access control framework. However,
there are operation status codes that allow an IPP server to return
information back to a client about any potential access control
violations for an IPP object.
Hastings, et al. Standards Track [Page 158]
RFC 2911 IPP/1.1: Model and Semantics September 2000
During a create operation, the client's identity is recorded in the
Job object in an implementation-defined attribute. This information
can be used to verify a client's identity for subsequent operations
on that Job object in order to enforce any access control policy that
might be in effect. See section 8.3 below for more details.
Since the security levels or the specific threats that an IPP system
administrator may be concerned with cannot be anticipated, IPP MUST
be capable of operating with different security mechanisms and
security policies as required by the individual installation.
Security policies might vary from very strong, to very weak, to none
at all, and corresponding security mechanisms will be required.
The following sections describe specific security attacks for IPP
environments. Where examples are provided they should be considered
illustrative of the environment and not an exhaustive set. Not all of
these environments will necessarily be addressed in initial
implementations of IPP.
This environment is typical of internal networks where traditional
office workers print the output of personal productivity applications
on shared work-group printers, or where batch applications print
their output on large production printers. Although the identity of
the user may be trusted in this environment, a user might want to
protect the content of a document against such attacks as
eavesdropping, replaying or tampering.
Examples of this environment include printing a document created by
the client on a publicly available printer, such as at a commercial
print shop; or printing a document remotely on a business associate's
printer. This latter operation is functionally equivalent to sending
the document to the business associate as a facsimile. Printing
sensitive information on a Printer in a different security domain
requires strong security measures. In this environment authentication
of the printer is required as well as protection against unauthorized
use of print resources. Since the document crosses security domains,
protection against eavesdropping and document tampering are also
required. It will also be important in this environment to protect
Printers against "spamming" and malicious document content.
Hastings, et al. Standards Track [Page 159]
RFC 2911 IPP/1.1: Model and Semantics September 2000
When the document is not stored on the client, printing can be done
by reference. That is, the print request can contain a reference, or
pointer, to the document instead of the actual document itself (see
sections 3.2.2 and 3.3.2). Standard methods currently do not exist
for remote entities to "assume" the credentials of a client for
forwarding requests to a 3rd party. It is anticipated that Print-By-
Reference will be used to access "public" documents and that
sophisticated methods for authenticating "proxies" is not specified
in this document.
The "printer-uri-supported" attribute contains the Printer object's
URI(s). Its companion attribute, "uri-security-supported",
identifies the security mechanism used for each URI listed in the
"printer-uri-supported" attribute. For each Printer operation
request, a client MUST supply only one URI in the "printer-uri"
operation attribute. In other words, even though the Printer
supports more than one URI, the client only interacts with the
Printer object using one if its URIs. This duality is not needed for
Job objects, since the Printer objects is the factory for Job
objects, and the Printer object will generate the correct URI for new
Job objects depending on the Printer object's security configuration.
Each URI has an authentication mechanism associated with it. If the
URI is the i'th element of "printer-uri-supported", then
authentication mechanism is the "i th" element of "uri-
authentication-supported". For a list of possible authentication
mechanisms, see section 4.4.2.
The Printer object uses an authentication mechanism to determine the
name of the user performing an operation. This user is called the
"authenticated user". The credibility of authentication depends on
the mechanism that the Printer uses to obtain the user's name. When
the authentication mechanism is 'none', all authenticated users are
"anonymous".
During job creation operations, the Printer initializes the value of
the "job-originating-user-name" attribute (see section 4.3.6) to be
the authenticated user. The authenticated user is this case is called
the "job owner".
Hastings, et al. Standards Track [Page 160]
RFC 2911 IPP/1.1: Model and Semantics September 2000
If an implementation can be configured to support more than one
authentication mechanism (see section 4.4.2), then it MUST implement
rules for determining equality of authenticated user names which have
been authenticated via different authentication mechanisms. One
possible policy is that identical names that are authenticated via
different mechanisms are different. For example, a user can cancel
his job only if he uses the same authentication mechanism for both
Cancel-Job and Print-Job. Another policy is that identical names
that are authenticated via different mechanism are the same if the
authentication mechanism for the later operation is not less strong
than the authentication mechanism for the earlier job creation
operation. For example, a user can cancel his job only if he uses
the same or stronger authentication mechanism for Cancel-Job and
Print-Job. With this second policy a job submitted via 'requesting-
user-name' authentication could be canceled via 'digest'
authentication. With the first policy, the job could not be canceled
in this way.
A client is able to determine the authentication mechanism used to
create a job. It is the i'th value of the Printer's "uri-
authentication-supported" attribute (see section 4.4.2), where i is
the index of the element of the Printer's "printer-uri-supported"
attribute (see section 4.4.1) equal to the job's "job-printer-uri"
attribute (see section 4.3.3).
In many IPP operations, a client supplies a list of attributes to be
returned in the response. For security reasons, an IPP object may be
configured not to return all attributes (or all values) that a client
requests. The job attributes returned MAY depend on whether the
requesting user is the same as the user that submitted the job. The
IPP object MAY even return none of the requested attributes. In such
cases, the status returned is the same as if the object had returned
all requested attributes. The client cannot tell by such a response
whether the requested attribute was present or absent on the object.
For the three printer operations Pause-Printer, Resume-Printer, and
Purge-Jobs (see sections 3.2.7, 3.2.8 and 3.2.9), the requesting user
is intended to be an operator or administrator of the Printer object
(see section 1). Otherwise, the IPP Printer MUST reject the
operation and return: 'client-error-forbidden', 'client-error-not-
authenticated', or 'client-error-not-authorized' as appropriate. For
operations on jobs, the requesting user is intended to be the job
Hastings, et al. Standards Track [Page 161]
RFC 2911 IPP/1.1: Model and Semantics September 2000
owner or may be an operator or administrator of the Printer object.
The means for authorizing an operator or administrator of the Printer
object are not specified in this document.
If the device that an IPP Printer is representing is able to accept
jobs using other job submission protocols in addition to IPP, it is
RECOMMENDED that such an implementation at least allow such "foreign"
jobs to be queried using Get-Jobs returning "job-id" and "job-uri" as
'unknown'. Such an implementation NEED NOT support all of the same
IPP job attributes as for IPP jobs. The IPP object returns the
'unknown' out-of-band value for any requested attribute of a foreign
job that is supported for IPP jobs, but not for foreign jobs.
It is further RECOMMENDED, that the IPP Printer generate "job-id" and
"job-uri" values for such "foreign jobs", if possible, so that they
may be targets of other IPP operations, such as Get-Job-Attributes
and Cancel-Job. Such an implementation also needs to deal with the
problem of authentication of such foreign jobs. One approach would
be to treat all such foreign jobs as belonging to users other than
the user of the IPP client. Another approach would be for the
foreign job to belong to 'anonymous'. Only if the IPP client has
been authenticated as an operator or administrator of the IPP Printer
object, could the foreign jobs be queried by an IPP request.
Alternatively, if the security policy is to allow users to query
other users' jobs, then the foreign jobs would also be visible to an
end-user IPP client using Get-Jobs and Get-Job-Attributes.
[ASME-Y14.1M] Metric Drawing Sheet Size and Format, ASME Y14.1M-1995.
This standard defines metric sheet sizes and formats
for engineering drawings.
[ASCII] Coded Character Set - 7-bit American Standard Code for
Information Interchange (ASCII), ANSI X3.4-1986. This
standard is the specification of the US-ASCII charset.
[BCP-11] Bradner S. and R. Hovey, "The Organizations Involved in
the IETF Standards Process", BCP 11, RFC 2028, October
1996.
[HTPP] J. Barnett, K. Carter, R. DeBry, "Initial Draft -
Hypertext Printing Protocol - HTPP/1.0", October 1996,
ftp://ftp.pwg.org/pub/pwg/ipp/historic/htpp/overview.ps.gz
Hastings, et al. Standards Track [Page 162]
RFC 2911 IPP/1.1: Model and Semantics September 2000
[IANA-CON] Narten, T. and H. Alvestrand, "Guidelines for Writing
an IANA Considerations Section in RFCs", BCP 26, RFC
2434, October 1998.
[IANA-CS] IANA Registry of Coded Character Sets:
ftp://ftp.isi.edu/in-notes/iana/assignments/character-
sets
[IANA-MT] IANA Registry of Media Types: ftp://ftp.isi.edu/in-
notes/iana/assignments/media-types/
[IPP-IIG] Hastings, T., Manros, C., Kugler, C., Holst, H., and P.
Zehler, "Internet Printing Protocol/1.1: draft-ietf-
ipp-implementers-guide-v11-01.txt, work in progress,
May 30, 2000.
[ISO10646-1] ISO/IEC 10646-1:1993, "Information technology --
Universal Multiple-Octet Coded Character Set (UCS) -
Part 1: Architecture and Basic Multilingual Plane,
JTC1/SC2."
[ISO8859-1] ISO/IEC 8859-1:1987, "Information technology -- 8-bit
One-Byte Coded Character Set - Part 1: Latin Alphabet
Nr 1", 1987, JTC1/SC2.
[ISO10175] ISO/IEC 10175 Document Printing Application (DPA), June
1996.
[LDPA] T. Hastings, S. Isaacson, M. MacKay, C. Manros, D.
Taylor, P. Zehler, "LDPA - Lightweight Document
Printing Application", October 1996,
ftp://ftp.pwg.org/pub/pwg/ipp/historic/ldpa/ldpa8.pdf.gz
[P1387.4] Kirk, M. (editor), POSIX System Administration - Part
4: Printing Interfaces, POSIX 1387.4 D8, 1994.
[PSIS] Herriot, R. (editor), X/Open A Printing System
Interoperability Specification (PSIS), August 1995.
[PWG] Printer Working Group, http://www.pwg.org.
[RFC1035] Mockapetris, P., "Domain Names - Implementation and
Specification", STD 13, RFC 1035, November 1987.
[RFC1179] McLaughlin, L., "Line Printer Daemon Protocol", RFC
1179, August 1990.
Hastings, et al. Standards Track [Page 163]
RFC 2911 IPP/1.1: Model and Semantics September 2000
[RFC1759] Smith, R., Wright, F., Hastings, T., Zilles, S. and J.
Gyllenskog, "Printer MIB", RFC 1759, March 1995.
[RFC1766] Alvestrand, H., "Tags for the Identification of
Languages", RFC 1766, March 1995.
[RFC1951] Deutsch, P., "DEFLATE Compressed Data Format
Specification version 1.3 ", RFC 1951, May 1996.
[RFC1952] Deutsch, P., "GZIP file format specification version
4.3", RFC 1952, May 1996.
[RFC1977] Schryver, V., "PPP BSD Compression Protocol", RFC 1977,
August 1996.
[RFC2026] Bradner, S., "The Internet Standards Process --
Revision 3", BCP 9, RFC 2026, October 1996.
[RFC2045] Freed, N. and N. Borenstein, ", Multipurpose Internet
Mail Extensions (MIME) Part One: Format of Internet
Message Bodies", RFC 2045, November 1996.
[RFC2046] Freed, N. and N. Borenstein, "Multipurpose Internet
Mail Extensions (MIME) Part Two: Media Types", RFC
2046, November 1996.
[RFC2048] Freed, N., Klensin, J. and J. Postel, "Multipurpose
Internet Mail Extension (MIME) Part Four: Registration
Procedures", RFC 2048, November 1996.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2228] Horowitz, M. and S. Lunt, "FTP Security Extensions",
RFC 2228, October 1997.
[RFC2246] Dierks, T. and C. Allen, "The TLS Protocol Version
1.0", RFC 2246, January 1999.
[RFC2277] Alvestrand, H., "IETF Policy on Character Sets and
Languages" BCP 18, RFC 2277, January 1998.
[RFC2278] Freed, N. and J. Postel: "IANA CharSet Registration
Procedures", BCP 19, RFC 2278, January 1998.
[RFC2279] Yergeau, F., "UTF-8, a transformation format of ISO
10646", RFC 2279, January 1998.
Hastings, et al. Standards Track [Page 164]
RFC 2911 IPP/1.1: Model and Semantics September 2000
[RFC2316] Bellovin, S., "Report of the IAB Security Architecture
Workshop", RFC 2316, April 1998.
[RFC2396] Berners-Lee, T., Fielding, R. and L. Masinter, "Uniform
Resource Identifiers (URI): Generic Syntax", RFC 2396,
August 1998.
[RFC2565] Herriot, R., Butler, S., Moore, P. and R. Turner,
"Internet Printing Protocol/1.0: Encoding and
Transport", RFC 2565, April 1999.
[RFC2566] deBry, R., Hastings, T., Herriot, R., Isaacson, S. and
P. Powell, "Internet Printing Protocol/1.0: Model and
Semantics", RFC 2566, April 1999.
[RFC2567] Wright, D., "Design Goals for an Internet Printing
Protocol", RFC 2567, April 1999.
[RFC2568] Zilles, S., "Rationale for the Structure and Model and
Protocol for the Internet Printing Protocol", RFC 2568,
April 1999.
[RFC2569] Herriot, R., Hastings, T., Jacobs, N. and J. Martin,
"Mapping between LPD and IPP Protocols", RFC 2569,
April 1999.
[RFC2579] McCloghrie, K., Perkins, D. and J. Schoenwaelder,
"Textual Conventions for SMIv2", STD 58, RFC 2579,
April 1999.
[RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,
Masinter, L., Leach, P. and T. Berners-Lee, "Hypertext
Transfer Protocol - HTTP/1.1", RFC 2616, June 1999.
[RFC2617] Franks, J., Hallam-Baker, P., Hostetler, J., Lawrence,
S., Leach, P., Luotonen, A. and L. Stewart, "HTTP
Authentication: Basic and Digest Access
Authentication", RFC 2617, June 1999.
[RFC2639] Hastings, T. and C. Manros, "Internet Printing
Protocol/1.0: Encoding and Transport", RFC 2639, July
1999.
[RFC2910] Herriot, R., Butler, S., Moore, P., Turner, R. and J.
Wenn, "Internet Printing Protocol/1.1: Encoding and
Transport", RFC 2910, September 2000.
Hastings, et al. Standards Track [Page 165]
RFC 2911 IPP/1.1: Model and Semantics September 2000
[SSL] Netscape, The SSL Protocol, Version 3, (Text version
3.02), November 1996.
[SWP] P. Moore, B. Jahromi, S. Butler, "Simple Web Printing
SWP/1.0", May 7, 1997,
ftp://ftp.pwg.org/pub/pwg/ipp/new_PRO/swp9705.pdf
Scott A. Isaacson, Editor
Novell, Inc.
122 E 1700 S
Provo, UT 84606
Phone: 801-861-7366
Fax: 801-861-2517
EMail: sisaacson@novell.com
Tom Hastings
Xerox Corporation
737 Hawaii St. ESAE 231
El Segundo, CA 90245
Phone: 310-333-6413
Fax: 310-333-5514
EMail: hastings@cp10.es.xerox.com
Robert Herriot
Xerox Corp.
3400 Hill View Ave, Building 1
Palo Alto, CA 94304
Phone: 650-813-7696
Fax: 650-813-6860
EMail: robert.herriot@pahv.xerox.com
Roger deBry
Utah Valley State College
Orem, UT 84058
Phone: (801) 222-8000
EMail: debryro@uvsc.edu
Hastings, et al. Standards Track [Page 166]
RFC 2911 IPP/1.1: Model and Semantics September 2000
Patrick Powell
Astart Technologies
9475 Chesapeake Dr., Suite D
San Diego, CA 95123
Phone: (619) 874-6543
Fax: (619) 279-8424
EMail: papowell@astart.com
IPP Web Page: http://www.pwg.org/ipp/
IPP Mailing List: ipp@pwg.org
To subscribe to the ipp mailing list, send the following email:
1) send it to majordomo@pwg.org
2) leave the subject line blank
3) put the following two lines in the message body:
subscribe ipp
end
Implementers of this specification document are encouraged to join
IPP Mailing List in order to participate in any discussions of
clarification issues and review of registration proposals for
additional attributes and values.
Other Participants:
Chuck Adams - Tektronix Shivaun Albright - HP
Stefan Andersson - Axis Jeff Barnett - IBM
Ron Bergman - Hitachi Koki Imaging Dennis Carney - IBM
Systems
Keith Carter - IBM Angelo Caruso - Xerox
Rajesh Chawla - TR Computing Nancy Chen - Okidata
Solutions
Josh Cohen - Microsoft Jeff Copeland - QMS
Andy Davidson - Tektronix Roger deBry - IBM
Maulik Desai - Auco Mabry Dozier - QMS
Lee Farrell - Canon Information Satoshi Fujitami - Ricoh
Systems
Steve Gebert - IBM Sue Gleeson - Digital
Charles Gordon - Osicom Brian Grimshaw - Apple
Jerry Hadsell - IBM Richard Hart - Digital
Tom Hastings - Xerox Henrik Holst - I-data
Stephen Holmstead Zhi-Hong Huang - Zenographics
Scott Isaacson - Novell Babek Jahromi - Microsoft
Swen Johnson - Xerox David Kellerman - Northlake
Software
Robert Kline - TrueSpectra Charles Kong - Panasonic
Carl Kugler - IBM Dave Kuntz - Hewlett-Packard
Hastings, et al. Standards Track [Page 167]
RFC 2911 IPP/1.1: Model and Semantics September 2000
Takami Kurono - Brother Rick Landau - Digital
Scott Lawrence - Agranot Systems Greg LeClair - Epson
Dwight Lewis - Lexmark Harry Lewis - IBM
Tony Liao - Vivid Image Roy Lomicka - Digital
Pete Loya - HP Ray Lutz - Cognisys
Mike MacKay - Novell, Inc. David Manchala - Xerox
Carl-Uno Manros - Xerox Jay Martin - Underscore
Stan McConnell - Xerox Larry Masinter - Xerox
Sandra Matts - Hewlett Packard Peter Michalek - Shinesoft
Ira McDonald - High North Inc. Mike Moldovan - G3 Nova
Tetsuya Morita - Ricoh Yuichi Niwa - Ricoh
Pat Nogay - IBM Ron Norton - Printronics
Hugo Parra, Novell Bob Pentecost - Hewlett-Packard
Patrick Powell - Astart Jeff Rackowitz - Intermec
Technologies
Eric Random - Peerless Rob Rhoads - Intel
Xavier Riley - Xerox Gary Roberts - Ricoh
David Roach - Unisys Stuart Rowley - Kyocera
Yuji Sasaki - Japan Computer Richard Schneider - Epson
Industry
Kris Schoff - HP Katsuaki Sekiguchi - Canon
Bob Setterbo - Adobe Gail Songer - Peerless
Hideki Tanaka - Cannon Devon Taylor - Novell
Mike Timperman - Lexmark Atsushi Uchino - Epson
Shigeru Ueda - Canon Bob Von Andel - Allegro Software
William Wagner - NetSilicon/DPI Jim Walker - DAZEL
Chris Wellens - Interworking Labs Trevor Wells - Hewlett Packard
Craig Whittle - Sharp Labs Rob Whittle - Novell, Inc.
Jasper Wong - Xionics Don Wright - Lexmark
Michael Wu - Heidelberg Digital Rick Yardumian - Xerox
Michael Yeung - Toshiba Lloyd Young - Lexmark
Atsushi Yuki - Kyocera Peter Zehler - Xerox
William Zhang- Canon Information Frank Zhao - Panasonic
Systems
Steve Zilles - Adobe Rob Zirnstein - Canon Information
Systems
In order to propose an IPP extension for registration, the proposer
must submit an application to IANA by email to "iana@iana.org" or by
filling out the appropriate form on the IANA web pages
(http://www.iana.org). This section specifies the required
information and the formats for proposing registrations of extensions
to IPP as provided in Section 6 for:
Hastings, et al. Standards Track [Page 168]
RFC 2911 IPP/1.1: Model and Semantics September 2000
1. type2 'keyword' attribute values
2. type3 'keyword' attribute values
3. type2 'enum' attribute values
4. type3 'enum' attribute values
5. attributes
6. attribute syntaxes
7. operations
8. status codes
9. out-of-band attribute values
Type of registration: type2 keyword attribute value
Name of attribute to which this keyword specification is to be added:
Proposed keyword name of this keyword value:
Specification of this keyword value (follow the style of IPP Model
Section 4.1.2.3):
Name of proposer:
Address of proposer:
Email address of proposer:
Note: For type2 keywords, the Designated Expert will be the point of
contact for the approved registration specification, if any
maintenance of the registration specification is needed.
Type of registration: type3 keyword attribute value
Name of attribute to which this keyword specification is to be added:
Proposed keyword name of this keyword value:
Specification of this keyword value (follow the style of IPP Model
Section 4.1.2.3):
Name of proposer:
Address of proposer:
Email address of proposer:
Note: For type3 keywords, the proposer will be the point of contact
for the approved registration specification, if any maintenance of
the registration specification is needed.
Type of registration: type2 enum attribute value
Name of attribute to which this enum specification is to be added:
Keyword symbolic name of this enum value:
Numeric value (to be assigned by the IPP Designated Expert in
consultation with IANA):
Hastings, et al. Standards Track [Page 169]
RFC 2911 IPP/1.1: Model and Semantics September 2000
Specification of this enum value (follow the style of IPP Model
Section 4.1.4):
Name of proposer:
Address of proposer:
Email address of proposer:
Note: For type2 enums, the Designated Expert will be the point of
contact for the approved registration specification, if any
maintenance of the registration specification is needed.
Type of registration: type3 enum attribute value
Name of attribute to which this enum specification is to be added:
Keyword symbolic name of this enum value:
Numeric value (to be assigned by the IPP Designated Expert in
consultation with IANA):
Specification of this enum value (follow the style of IPP Model
Section 4.1.4):
Name of proposer:
Address of proposer:
Email address of proposer:
Note: For type3 enums, the proposer will be the point of contact for
the approved registration specification, if any maintenance of the
registration specification is needed.
Type of registration: attribute
Proposed keyword name of this attribute:
Types of attribute (Operation, Job Template, Job Description, Printer
Description):
Operations to be used with if the attribute is an operation attribute:
Object (Job, Printer, etc. if bound to an object):
Attribute syntax(es) (include 1setOf and range as in Section 4.2):
If attribute syntax is 'keyword' or 'enum', is it type2 or type3:
If this is a Printer attribute, MAY the value returned depend on
"document-format" (See Section 6.2):
If this is a Job Template attribute, how does its specification depend
on the value of the "multiple-document-handling" attribute:
Specification of this attribute (follow the style of IPP Model Section
4.2):
Name of proposer:
Address of proposer:
Email address of proposer:
Hastings, et al. Standards Track [Page 170]
RFC 2911 IPP/1.1: Model and Semantics September 2000
Note: For attributes, the IPP Designated Expert will be the point of
contact for the approved registration specification, if any
maintenance of the registration specification is needed.
Type of registration: attribute syntax
Proposed name of this attribute syntax:
Type of attribute syntax (integer, octetString, character-string, see
[RFC2910]):
Numeric tag according to [RFC2910] (to be assigned by the IPP
Designated Expert in consultation with IANA):
Specification of this attribute (follow the style of IPP Model Section
4.1):
Name of proposer:
Address of proposer:
Email address of proposer:
Note: For attribute syntaxes, the IPP Designated Expert will be the
point of contact for the approved registration specification, if any
maintenance of the registration specification is needed.
Type of registration: operation
Proposed name of this operation:
Numeric operation-id value according to section 4.4.15 (to be assigned
by the IPP Designated Expert in consultation with IANA):
Object Target (Job, Printer, etc. that operation is upon):
Specification of this operation (follow the style of IPP Model Section
3):
Name of proposer:
Address of proposer:
Email address of proposer:
Note: For operations, the IPP Designated Expert will be the point of
contact for the approved registration specification, if any
maintenance of the registration specification is needed.
Type of registration: attribute group
Proposed name of this attribute group:
Numeric tag according to [RFC2910] (to be assigned by the IPP
Designated Expert in consultation with IANA):
Operation requests and group number for each operation in which the
attribute group occurs:
Hastings, et al. Standards Track [Page 171]
RFC 2911 IPP/1.1: Model and Semantics September 2000
Operation responses and group number for each operation in which the
attribute group occurs:
Specification of this attribute group (follow the style of IPP Model
Section 3):
Name of proposer:
Address of proposer:
Email address of proposer:
Note: For attribute groups, the IPP Designated Expert will be the
point of contact for the approved registration specification, if any
maintenance of the registration specification is needed.
Type of registration: status code
Keyword symbolic name of this status code value:
Numeric value (to be assigned by the IPP Designated Expert in
consultation with IANA):
Operations that this status code may be used with:
Specification of this status code (follow the style of IPP Model
Section 13 APPENDIX B: Status Codes and Suggested Status Code
Messages):
Name of proposer:
Address of proposer:
Email address of proposer:
Note: For status codes, the Designated Expert will be the point of
contact for the approved registration specification, if any
maintenance of the registration specification is needed.
Type of registration: out-of-band attribute value
Proposed name of this out-of-band attribute value:
Numeric tag according to [RFC2910] (to be assigned by the IPP Designated
Expert in consultation with IANA):
Operations that this out-of-band attribute value may be used with:
Attributes that this out-of-band attribute value may be used with:
Specification of this out-of-band attribute value (follow the style of
the beginning of IPP Model Section 4.1):
Name of proposer:
Address of proposer:
Email address of proposer:
Note: For out-of-band attribute values, the IPP Designated Expert
will be the point of contact for the approved registration
specification, if any maintenance of the registration specification
is needed.
Hastings, et al. Standards Track [Page 172]
RFC 2911 IPP/1.1: Model and Semantics September 2000
The key words "MUST", "MUST NOT", "REQUIRED", "SHOULD", "SHOULD NOT",
"RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be
interpreted as described in RFC 2119 [RFC2119].
This term is not included in RFC 2119. The verb "NEED NOT" indicates
an action that the subject of the sentence does not have to implement
in order to claim conformance to the standard. The verb "NEED NOT"
is used instead of "MAY NOT" since "MAY NOT" sounds like a
prohibition.
Keywords are used within this document as identifiers of semantic
entities within the abstract model (see section 4.1.2.3). Attribute
names, some attribute values, attribute syntaxes, and attribute group
names are represented as keywords.
An attribute is an item of information that is associated with an
instance of an IPP object. An attribute consists of an attribute
name and one or more attribute values. Each attribute has a specific
attribute syntax. All object attributes are defined in section 4 and
all operation attributes are defined in section 3.
Job Template Attributes are described in section 4.2. The client
optionally supplies Job Template attributes in a create request
(operation requests that create Job objects). The Printer object has
associated attributes which define supported and default values for
the Printer.
Each attribute is uniquely identified in this document by its
attribute name. An attribute name is a keyword. The keyword
attribute name is given in the section header describing that
Hastings, et al. Standards Track [Page 173]
RFC 2911 IPP/1.1: Model and Semantics September 2000
attribute. In running text in this document, attribute names are
indicated inside double quotation marks (") where the quotation marks
are not part of the keyword itself.
Related attributes are grouped into named groups. The name of the
group is a keyword. The group name may be used in place of naming
all the attributes in the group explicitly. Attribute groups are
defined in section 3.
Each attribute has one or more values. Attribute values are
represented in the syntax type specified for that attribute. In
running text in this document, attribute values are indicated inside
single quotation marks ('), whether their attribute syntax is
keyword, integer, text, etc. where the quotation marks are not part
of the value itself.
Each attribute is defined using an explicit syntax type. In this
document, each syntax type is defined as a keyword with specific
meaning. The "Encoding and Transport" document [RFC2910] indicates
the actual "on-the-wire" encoding rules for each syntax type.
Attribute syntax types are defined in section 4.1.
By definition, a Printer object supports an attribute only if that
Printer object responds with the corresponding attribute populated
with some value(s) in a response to a query for that attribute. A
Printer object supports an attribute value if the value is one of the
Printer object's "supported values" attributes. The device behind a
Printer object may exhibit a behavior that corresponds to some IPP
attribute, but if the Printer object, when queried for that
attribute, doesn't respond with the attribute, then as far as IPP is
concerned, that implementation does not support that feature. If the
Printer object's "xxx-supported" attribute is not populated with a
particular value (even if that value is a legal value for that
attribute), then that Printer object does not support that particular
value.
Hastings, et al. Standards Track [Page 174]
RFC 2911 IPP/1.1: Model and Semantics September 2000
A conforming implementation MUST support all REQUIRED attributes.
However, even for REQUIRED attributes, conformance to IPP does not
mandate that all implementations support all possible values
representing all possible job processing behaviors and features. For
example, if a given instance of a Printer supports only certain
document formats, then that Printer responds with the "document-
format-supported" attribute populated with a set of values, possibly
only one, taken from the entire set of possible values defined for
that attribute. This limited set of values represents the Printer's
set of supported document formats. Supporting an attribute and some
set of values for that attribute enables IPP end users to be aware of
and make use of those features associated with that attribute and
those values. If an implementation chooses to not support an
attribute or some specific value, then IPP end users would have no
ability to make use of that feature within the context of IPP itself.
However, due to existing practice and legacy systems which are not
IPP aware, there might be some other mechanism outside the scope of
IPP to control or request the "unsupported" feature (such as embedded
instructions within the document data itself).
For example, consider the "finishings-supported" attribute.
1) If a Printer object is not physically capable of stapling, the
"finishings-supported" attribute MUST NOT be populated with the
value of 'staple'.
2) A Printer object is physically capable of stapling, however an
implementation chooses not to support stapling in the IPP
"finishings" attribute. In this case, 'staple' MUST NOT be a
value in the "finishings-supported" Printer object attribute.
Without support for the value 'staple', an IPP end user would
have no means within the protocol itself to request that a Job
be stapled. However, an existing document data formatter might
be able to request that the document be stapled directly with
an embedded instruction within the document data. In this
case, the IPP implementation does not "support" stapling,
however the end user is still able to have some control over
the stapling of the completed job.
3) A Printer object is physically capable of stapling, and an
implementation chooses to support stapling in the IPP
"finishings" attribute. In this case, 'staple' MUST be a value
in the "finishings-supported" Printer object attribute. Doing
so, would enable end users to be aware of and make use of the
stapling feature using IPP attributes.
Hastings, et al. Standards Track [Page 175]
RFC 2911 IPP/1.1: Model and Semantics September 2000
Even though support for Job Template attributes by a Printer object
is OPTIONAL, it is RECOMMENDED that if the device behind a Printer
object is capable of realizing any feature or function that
corresponds to an IPP attribute and some associated value, then that
implementation SHOULD support that IPP attribute and value.
The set of values in any of the supported value attributes is set
(populated) by some administrative process or automatic sensing
mechanism that is outside the scope of this IPP/1.1 document. For
administrative policy and control reasons, an administrator may
choose to make only a subset of possible values visible to the end
user. In this case, the real output device behind the IPP Printer
abstraction may be capable of a certain feature, however an
administrator is specifying that access to that feature not be
exposed to the end user through the IPP protocol. Also, since a
Printer object may represent a logical print device (not just a
physical device) the actual process for supporting a value is
undefined and left up to the implementation. However, if a Printer
object supports a value, some manual human action may be needed to
realize the semantic action associated with the value, but no end
user action is required.
For example, if one of the values in the "finishings-supported"
attribute is 'staple', the actual process might be an automatic
staple action by a physical device controlled by some command sent to
the device. Or, the actual process of stapling might be a manual
action by an operator at an operator attended Printer object.
For another example of how supported attributes function, consider a
system administrator who desires to control all print jobs so that no
job sheets are printed in order to conserve paper. To force no job
sheets, the system administrator sets the only supported value for
the "job-sheets-supported" attribute to 'none'. In this case, if a
client requests anything except 'none', the create request is
rejected or the "job-sheets" value is ignored (depending on the value
of "ipp-attribute-fidelity"). To force the use of job start/end
sheets on all jobs, the administrator does not include the value
'none' in the "job-sheets- supported" attribute. In this case, if a
client requests 'none', the create request is rejected or the "job-
sheets" value is ignored (again depending on the value of "ipp-
attribute-fidelity").
A "print-stream page" is a page according to the definition of pages
in the language used to express the document data.
Hastings, et al. Standards Track [Page 176]
RFC 2911 IPP/1.1: Model and Semantics September 2000
This section defines status code enum keywords and values that are
used to provide semantic information on the results of an operation
request. Each operation response MUST include a status code. The
response MAY also contain a status message that provides a short
textual description of the status. The status code is intended for
use by automata, and the status message is intended for the human end
user. Since the status message is an OPTIONAL component of the
operation response, an IPP application (i.e., a browser, GUI, print
driver or gateway) is NOT REQUIRED to examine or display the status
message, since it MAY not be returned to the application.
The prefix of the status keyword defines the class of response as
follows:
"informational" - Request received, continuing process
"successful" - The action was successfully received, understood,
and accepted
"redirection" - Further action must be taken in order to complete
the request
"client-error" - The request contains bad syntax or cannot be
fulfilled
"server-error" - The IPP object failed to fulfill an apparently
valid request
As with type2 enums, IPP status codes are extensible. IPP clients
are NOT REQUIRED to understand the meaning of all registered status
codes, though such understanding is obviously desirable. However,
IPP clients MUST understand the class of any status code, as
indicated by the prefix, and treat any unrecognized response as being
equivalent to the first status code of that class, with the exception
that an unrecognized response MUST NOT be cached. For example, if an
unrecognized status code of "client-error-xxx-yyy" is received by the
client, it can safely assume that there was something wrong with its
request and treat the response as if it had received a "client-
error-bad-request" status code. In such cases, IPP applications
SHOULD present the OPTIONAL message (if present) to the end user
since the message is likely to contain human readable information
which will help to explain the unusual status. The name of the enum
is the suggested status message for US English.
Hastings, et al. Standards Track [Page 177]
RFC 2911 IPP/1.1: Model and Semantics September 2000
The status code values range from 0x0000 to 0x7FFF. The value ranges
for each status code class are as follows:
"successful" - 0x0000 to 0x00FF
"informational" - 0x0100 to 0x01FF
"redirection" - 0x0200 to 0x02FF
"client-error" - 0x0400 to 0x04FF
"server-error" - 0x0500 to 0x05FF
The top half (128 values) of each range (0x0n40 to 0x0nFF, for n = 0
to 5) is reserved for vendor use within each status code class.
Values 0x0600 to 0x7FFF are reserved for future assignment by IETF
standards track documents and MUST NOT be used.
Each status code is described below. Section 13.1.5.9 contains a
table that indicates which status codes apply to which operations.
The Implementer's Guide [IPP-IIG] describe the suggested steps for
processing IPP attributes for all operations, including returning
status codes.
This class of status code indicates a provisional response and is to
be used for informational purposes only.
There are no status codes defined in IPP/1.1 for this class of status
code.
The request has succeeded and no request attributes were substituted
or ignored. In the case of a response to a create request, the
'successful-ok' status code indicates that the request was
successfully received and validated, and that the Job object has been
created; it does not indicate that the job has been processed. The
transition of the Job object into the 'completed' state is the only
indicator that the job has been printed.
Hastings, et al. Standards Track [Page 178]
RFC 2911 IPP/1.1: Model and Semantics September 2000
The request has succeeded, but some supplied (1) attributes were
ignored or (2) unsupported values were substituted with supported
values or were ignored in order to perform the operation without
rejecting it. Unsupported attributes, attribute syntaxes, or values
MUST be returned in the Unsupported Attributes group of the response
for all operations. There is an exception to this rule for the query
operations: Get-Printer-Attributes, Get-Jobs, and Get-Job-Attributes
for the "requested-attributes" operation attribute only. When the
supplied values of the "requested-attributes" operation attribute are
requesting attributes that are not supported, the IPP object MAY, but
is NOT REQUIRED to, return the "requested-attributes" attribute in
the Unsupported Attribute response group (with the unsupported values
only). See sections 3.1.7 and 3.2.1.2.
The request has succeeded, but some supplied attribute values
conflicted with the values of other supplied attributes. These
conflicting values were either (1) substituted with (supported)
values or (2) the attributes were removed in order to process the job
without rejecting it. Attributes or values which conflict with other
attributes and have been substituted or ignored MUST be returned in
the Unsupported Attributes group of the response for all operations
as supplied by the client. See sections 3.1.7 and 3.2.1.2.
This class of status code indicates that further action needs to be
taken to fulfill the request.
There are no status codes defined in IPP/1.1 for this class of status
code.
This class of status code is intended for cases in which the client
seems to have erred. The IPP object SHOULD return a message
containing an explanation of the error situation and whether it is a
temporary or permanent condition.
Hastings, et al. Standards Track [Page 179]
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The request could not be understood by the IPP object due to
malformed syntax (such as the value of a fixed length attribute whose
length does not match the prescribed length for that attribute - see
the Implementer's Guide [IPP-IIG] ). The IPP application SHOULD NOT
repeat the request without modifications.
The IPP object understood the request, but is refusing to fulfill it.
Additional authentication information or authorization credentials
will not help and the request SHOULD NOT be repeated. This status
code is commonly used when the IPP object does not wish to reveal
exactly why the request has been refused or when no other response is
applicable.
The request requires user authentication. The IPP client may repeat
the request with suitable authentication information. If the request
already included authentication information, then this status code
indicates that authorization has been refused for those credentials.
If this response contains the same challenge as the prior response,
and the user agent has already attempted authentication at least
once, then the response message may contain relevant diagnostic
information. This status codes reveals more information than
"client-error-forbidden".
The requester is not authorized to perform the request. Additional
authentication information or authorization credentials will not help
and the request SHOULD NOT be repeated. This status code is used
when the IPP object wishes to reveal that the authentication
information is understandable, however, the requester is explicitly
not authorized to perform the request. This status codes reveals
more information than "client-error-forbidden" and "client-error-
not-authenticated".
This status code is used when the request is for something that can
not happen. For example, there might be a request to cancel a job
that has already been canceled or aborted by the system. The IPP
client SHOULD NOT repeat the request.
Hastings, et al. Standards Track [Page 180]
RFC 2911 IPP/1.1: Model and Semantics September 2000
The client did not produce a request within the time that the IPP
object was prepared to wait. For example, a client issued a Create-
Job operation and then, after a long period of time, issued a Send-
Document operation and this error status code was returned in
response to the Send-Document request (see section 3.3.1). The IPP
object might have been forced to clean up resources that had been
held for the waiting additional Documents. The IPP object was forced
to close the Job since the client took too long. The client SHOULD
NOT repeat the request without modifications.
The IPP object has not found anything matching the request URI. No
indication is given of whether the condition is temporary or
permanent. For example, a client with an old reference to a Job (a
URI) tries to cancel the Job, however in the mean time the Job might
have been completed and all record of it at the Printer has been
deleted. This status code, 'client-error-not-found' is returned
indicating that the referenced Job can not be found. This error
status code is also used when a client supplies a URI as a reference
to the document data in either a Print-URI or Send-URI operation, but
the document can not be found.
In practice, an IPP application should avoid a not found situation by
first querying and presenting a list of valid Printer URIs and Job
URIs to the end-user.
The requested object is no longer available and no forwarding address
is known. This condition should be considered permanent. Clients
with link editing capabilities should delete references to the
request URI after user approval. If the IPP object does not know or
has no facility to determine, whether or not the condition is
permanent, the status code "client-error-not-found" should be used
instead.
This response is primarily intended to assist the task of maintenance
by notifying the recipient that the resource is intentionally
unavailable and that the IPP object administrator desires that remote
links to that resource be removed. It is not necessary to mark all
permanently unavailable resources as "gone" or to keep the mark for
any length of time -- that is left to the discretion of the IPP
object administrator and/or Printer implementation.
Hastings, et al. Standards Track [Page 181]
RFC 2911 IPP/1.1: Model and Semantics September 2000
The IPP object is refusing to process a request because the request
entity is larger than the IPP object is willing or able to process.
An IPP Printer returns this status code when it limits the size of
print jobs and it receives a print job that exceeds that limit or
when the attributes are so many that their encoding causes the
request entity to exceed IPP object capacity.
The IPP object is refusing to service the request because one or more
of the client-supplied attributes has a variable length value that is
longer than the maximum length specified for that attribute. The IPP
object might not have sufficient resources (memory, buffers, etc.) to
process (even temporarily), interpret, and/or ignore a value larger
than the maximum length. Another use of this error code is when the
IPP object supports the processing of a large value that is less than
the maximum length, but during the processing of the request as a
whole, the object may pass the value onto some other system component
which is not able to accept the large value. For more details, see
the Implementer's Guide [IPP-IIG] .
Note: For attribute values that are URIs, this rare condition is
only likely to occur when a client has improperly submitted a request
with long query information (e.g. an IPP application allows an end-
user to enter an invalid URI), when the client has descended into a
URI "black hole" of redirection (e.g., a redirected URI prefix that
points to a suffix of itself), or when the IPP object is under attack
by a client attempting to exploit security holes present in some IPP
objects using fixed-length buffers for reading or manipulating the
Request-URI.
The IPP object is refusing to service the request because the
document data is in a format, as specified in the "document-format"
operation attribute, that is not supported by the Printer object.
This error is returned independent of the client-supplied "ipp-
attribute-fidelity". The Printer object MUST return this status
code, even if there are other Job Template attributes that are not
supported as well, since this error is a bigger problem than with Job
Template attributes. See sections 3.1.6.1, 3.1.7, and 3.2.1.1.
Hastings, et al. Standards Track [Page 182]
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In a create request, if the Printer object does not support one or
more attributes, attribute syntaxes, or attribute values supplied in
the request and the client supplied the "ipp-attribute-fidelity"
operation attribute with the 'true' value, the Printer object MUST
return this status code. The Printer object MUST also return in the
Unsupported Attributes Group all the attributes and/or values
supplied by the client that are not supported. See section 3.1.7.
For example, if the request indicates 'iso-a4' media, but that media
type is not supported by the Printer object. Or, if the client
supplies a Job Template attribute and the attribute itself is not
even supported by the Printer. If the "ipp-attribute-fidelity"
attribute is 'false', the Printer MUST ignore or substitute values
for unsupported Job Template attributes and values rather than reject
the request and return this status code.
For any operation where a client requests attributes (such as a Get-
Jobs, Get-Printer-Attributes, or Get-Job-Attributes operation), if
the IPP object does not support one or more of the requested
attributes, the IPP object simply ignores the unsupported requested
attributes and processes the request as if they had not been
supplied, rather than returning this status code. In this case, the
IPP object MUST return the 'successful-ok-ignored-or-substituted-
attributes' status code and MAY return the unsupported attributes as
values of the "requested-attributes" in the Unsupported Attributes
Group (see section 13.1.2.2).
For any operation, if the IPP Printer does not support the charset
supplied by the client in the "attributes-charset" operation
attribute, the Printer MUST reject the operation and return this
status and any 'text' or 'name' attributes using the 'utf-8' charset
(see Section 3.1.4.1). See sections 3.1.6.1 and 3.1.7.
The request is rejected because some attribute values conflicted with
the values of other attributes which this document does not permit to
be substituted or ignored. The Printer object MUST also return in
the Unsupported Attributes Group the conflicting attributes supplied
by the client. See sections 3.1.7 and 3.2.1.2.
Hastings, et al. Standards Track [Page 183]
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The IPP object is refusing to service the request because the
document data, as specified in the "compression" operation attribute,
is compressed in a way that is not supported by the Printer object.
This error is returned independent of the client-supplied "ipp-
attribute-fidelity". The Printer object MUST return this status
code, even if there are other Job Template attributes that are not
supported as well, since this error is a bigger problem than with Job
Template attributes. See sections 3.1.6.1, 3.1.7, and 3.2.1.1.
The IPP object is refusing to service the request because the
document data cannot be decompressed when using the algorithm
specified by the "compression" operation attribute. This error is
returned independent of the client-supplied "ipp-attribute-fidelity".
The Printer object MUST return this status code, even if there are
Job Template attributes that are not supported as well, since this
error is a bigger problem than with Job Template attributes. See
sections 3.1.7 and 3.2.1.1.
The IPP object is refusing to service the request because Printer
encountered an error in the document data while interpreting it.
This error is returned independent of the client-supplied "ipp-
attribute-fidelity". The Printer object MUST return this status
code, even if there are Job Template attributes that are not
supported as well, since this error is a bigger problem than with Job
Template attributes. See sections 3.1.7 and 3.2.1.1.
The IPP object is refusing to service the Print-URI or Send-URI
request because Printer encountered an access error while attempting
to validate the accessibility or access the document data specified
in the "document-uri" operation attribute. The Printer MAY also
return a specific document access error code using the "document-
access-error" operation attribute (see section 3.1.6.4). This error
is returned independent of the client-supplied "ipp-attribute-
fidelity". The Printer object MUST return this status code, even if
there are Job Template attributes that are not supported as well,
since this error is a bigger problem than with Job Template
attributes. See sections 3.1.6.1 and 3.1.7.
Hastings, et al. Standards Track [Page 184]
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This class of status codes indicates cases in which the IPP object is
aware that it has erred or is incapable of performing the request.
The IPP object SHOULD include a message containing an explanation of
the error situation, and whether it is a temporary or permanent
condition.
The IPP object encountered an unexpected condition that prevented it
from fulfilling the request. This error status code differs from
"server-error-temporary-error" in that it implies a more permanent
type of internal error. It also differs from "server-error-device-
error" in that it implies an unexpected condition (unlike a paper-jam
or out-of-toner problem which is undesirable but expected). This
error status code indicates that probably some knowledgeable human
intervention is required.
The IPP object does not support the functionality required to fulfill
the request. This is the appropriate response when the IPP object
does not recognize an operation or is not capable of supporting it.
See sections 3.1.6.1 and 3.1.7.
The IPP object is currently unable to handle the request due to a
temporary overloading or maintenance of the IPP object. The
implication is that this is a temporary condition which will be
alleviated after some delay. If known, the length of the delay may be
indicated in the message. If no delay is given, the IPP application
should handle the response as it would for a "server-error-
temporary-error" response. If the condition is more permanent, the
error status codes "client-error-gone" or "client-error-not-found"
could be used.
The IPP object does not support, or refuses to support, the IPP
protocol version that was supplied as the value of the "version-
number" operation parameter in the request. The IPP object is
indicating that it is unable or unwilling to complete the request
using the same major and minor version number as supplied in the
request other than with this error message. The error response SHOULD
contain a "status-message" attribute (see section 3.1.6.2) describing
Hastings, et al. Standards Track [Page 185]
RFC 2911 IPP/1.1: Model and Semantics September 2000
why that version is not supported and what other versions are
supported by that IPP object. See sections 3.1.6.1, 3.1.7, and
3.1.8.
The error response MUST identify in the "version-number" operation
parameter the closest version number that the IPP object does
support. For example, if a client supplies version '1.0' and an
IPP/1.1 object supports version '1.0', then it responds with version
'1.0' in all responses to such a request. If the IPP/1.1 object does
not support version '1.0', then it should accept the request and
respond with version '1.1' or may reject the request and respond with
this error code and version
'1.1'. If a client supplies a version '1.2', the IPP/1.1 object
should accept the request and return version '1.1' or may reject the
request and respond with this error code and version '1.1'. See
sections 3.1.8 and 4.4.14.
A printer error, such as a paper jam, occurs while the IPP object
processes a Print or Send operation. The response contains the true
Job Status (the values of the "job-state" and "job-state-reasons"
attributes). Additional information can be returned in the OPTIONAL
"job-state-message" attribute value or in the OPTIONAL status message
that describes the error in more detail. This error status code is
only returned in situations where the Printer is unable to accept the
create request because of such a device error. For example, if the
Printer is unable to spool, and can only accept one job at a time,
the reason it might reject a create request is that the printer
currently has a paper jam. In many cases however, where the Printer
object can accept the request even though the Printer has some error
condition, the 'successful-ok' status code will be returned. In such
a case, the client would look at the returned Job Object Attributes
or later query the Printer to determine its state and state reasons.
A temporary error such as a buffer full write error, a memory
overflow (i.e. the document data exceeds the memory of the Printer),
or a disk full condition, occurs while the IPP Printer processes an
operation. The client MAY try the unmodified request again at some
later point in time with an expectation that the temporary internal
error condition may have been cleared. Alternatively, as an
implementation option, a Printer object MAY delay the response until
the temporary condition is cleared so that no error is returned.
Hastings, et al. Standards Track [Page 186]
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A temporary error indicating that the Printer is not currently
accepting jobs, because the administrator has set the value of the
Printer's "printer-is-accepting-jobs" attribute to 'false' (by means
outside the scope of this IPP/1.1 document).
A temporary error indicating that the Printer is too busy processing
jobs and/or other requests. The client SHOULD try the unmodified
request again at some later point in time with an expectation that
the temporary busy condition will have been cleared.
An error indicating that the job has been canceled by an operator or
the system while the client was transmitting the data to the IPP
Printer. If a job-id and job-uri had been created, then they are
returned in the Print-Job, Send-Document, or Send-URI response as
usual; otherwise, no job-id and job-uri are returned in the response.
The IPP object does not support multiple documents per job and a
client attempted to supply document data with a second Send-Document
or Send-URI operation.
PJ = Print-Job, PU = Print-URI, CJ = Create-Job, SD = Send-Document
SU = Send-URI, V = Validate-Job, GA = Get-Job-Attributes and
Get-Printer-Attributes, GJ = Get-Jobs, C = Cancel-Job
Hastings, et al. Standards Track [Page 187]
RFC 2911 IPP/1.1: Model and Semantics September 2000
IPP Operations
IPP Status Keyword PJ PU CJ SD SU V GA GJ C
------------------ -- -- -- -- -- - -- -- -
successful-ok x x x x x x x x x
successful-ok-ignored-or-substituted- x x x x x x x x x
attributes
successful-ok-conflicting-attributes x x x x x x x x x
client-error-bad-request x x x x x x x x x
client-error-forbidden x x x x x x x x x
client-error-not-authenticated x x x x x x x x x
client-error-not-authorized x x x x x x x x x
client-error-not-possible x x x x x x x x x
client-error-timeout x x
client-error-not-found x x x x x x x x x
client-error-gone x x x x x x x x x
client-error-request-entity-too-large x x x x x x x x x
client-error-request-value-too-long x x x x x x x x x
client-error-document-format-not- x x x x x x
supported
client-error-attributes-or-values-not- x x x x x x x x x
supported
client-error-uri-scheme-not-supported x x
client-error-charset-not-supported x x x x x x x x x
client-error-conflicting-attributes x x x x x x x x x
client-error-compression-not-supported x x x x x
client-error-compression-error x x x x
client-error-document-format-error x x x x
client-error-document-access-error x x
server-error-internal-error x x x x x x x x x
server-error-operation-not-supported x x x x
server-error-service-unavailable x x x x x x x x x
server-error-version-not-supported x x x x x x x x x
server-error-device-error x x x x x
server-error-temporary-error x x x x x
server-error-not-accepting-jobs x x x x
server-error-busy x x x x x x x x x
server-error-job-canceled x x x
server-error-multiple-document-jobs- x x
not-supported
HJ = Hold-Job, RJ = Release-Job, RS = Restart-Job
PP = Pause-Printer, RP = Resume-Printer, PJ = Purge-Jobs
Hastings, et al. Standards Track [Page 188]
RFC 2911 IPP/1.1: Model and Semantics September 2000
IPP Operations (cont.)
IPP Status Keyword HJ RJ RS PP RP PJ
------------------ -- -- -- -- -- --
successful-ok x x x x x x
successful-ok-ignored-or-substituted- x x x x x x
attributes
successful-ok-conflicting-attributes x x x x x x
client-error-bad-request x x x x x x
client-error-forbidden x x x x x x
client-error-not-authenticated x x x x x x
client-error-not-authorized x x x x x x
client-error-not-possible x x x x x x
client-error-timeout
client-error-not-found x x x x x x
client-error-gone x x x x x x
client-error-request-entity-too-large x x x x x x
client-error-request-value-too-long x x x x x x
client-error-document-format-not-
supported
client-error-attributes-or-values-not- x x x x x x
supported
client-error-uri-scheme-not-supported
client-error-charset-not-supported x x x x x x
client-error-conflicting-attributes x x x x x x
client-error-compression-not-supported
client-error-compression-error
client-error-document-format-error
client-error-document-access-error
server-error-internal-error x x x x x x
server-error-operation-not-supported x x x x x x
server-error-service-unavailable x x x x x x
server-error-version-not-supported x x x x x x
server-error-device-error
server-error-temporary-error x x x x x x
server-error-not-accepting-jobs
server-error-busy x x x x x x
server-error-job-canceled
server-error-multiple-document-jobs-
not-supported
Hastings, et al. Standards Track [Page 189]
RFC 2911 IPP/1.1: Model and Semantics September 2000
Standard keyword values are taken from several sources.
Standard values are defined (taken from DPA[ISO10175] and the Printer
MIB[RFC1759]):
'default': The default medium for the output device
'iso-a4-white': Specifies the ISO A4 white medium: 210 mm x 297 mm
'iso-a4-colored': Specifies the ISO A4 colored medium: 210 mm x 297
mm
'iso-a4-transparent' Specifies the ISO A4 transparent medium: 210 mm
x 297 mm
'iso-a3-white': Specifies the ISO A3 white medium: 297 mm x 420 mm
'iso-a3-colored': Specifies the ISO A3 colored medium: 297 mm x 420
mm
'iso-a5-white': Specifies the ISO A5 white medium: 148 mm x 210 mm
'iso-a5-colored': Specifies the ISO A5 colored medium: 148 mm x 210
mm
'iso-b4-white': Specifies the ISO B4 white medium: 250 mm x 353 mm
'iso-b4-colored': Specifies the ISO B4 colored medium: 250 mm x 353
mm
'iso-b5-white': Specifies the ISO B5 white medium: 176 mm x 250 mm
'iso-b5-colored': Specifies the ISO B5 colored medium: 176 mm x 250
mm
'jis-b4-white': Specifies the JIS B4 white medium: 257 mm x 364 mm
'jis-b4-colored': Specifies the JIS B4 colored medium: 257 mm x 364
mm
'jis-b5-white': Specifies the JIS B5 white medium: 182 mm x 257 mm
'jis-b5-colored': Specifies the JIS B5 colored medium: 182 mm x 257
mm
The following standard values are defined for North American media:
'na-letter-white': Specifies the North American letter white medium
'na-letter-colored': Specifies the North American letter colored
medium
'na-letter-transparent': Specifies the North American letter
transparent medium
'na-legal-white': Specifies the North American legal white medium
'na-legal-colored': Specifies the North American legal colored
medium
Hastings, et al. Standards Track [Page 190]
RFC 2911 IPP/1.1: Model and Semantics September 2000
The following standard values are defined for envelopes:
'iso-b4-envelope': Specifies the ISO B4 envelope medium
'iso-b5-envelope': Specifies the ISO B5 envelope medium
'iso-c3-envelope': Specifies the ISO C3 envelope medium
'iso-c4-envelope': Specifies the ISO C4 envelope medium
'iso-c5-envelope': Specifies the ISO C5 envelope medium
'iso-c6-envelope': Specifies the ISO C6 envelope medium
'iso-designated-long-envelope': Specifies the ISO Designated Long
envelope medium
'na-10x13-envelope': Specifies the North American 10x13 envelope
medium
'na-9x12-envelope': Specifies the North American 9x12 envelope
medium
'monarch-envelope': Specifies the Monarch envelope
'na-number-10-envelope': Specifies the North American number 10
business envelope medium
'na-7x9-envelope': Specifies the North American 7x9 inch envelope
'na-9x11-envelope': Specifies the North American 9x11 inch
envelope
'na-10x14-envelope': Specifies the North American 10x14 inch
envelope
'na-number-9-envelope': Specifies the North American number 9
business envelope
'na-6x9-envelope': Specifies the North American 6x9 inch envelope
'na-10x15-envelope': Specifies the North American 10x15 inch
envelope
The following standard values are defined for the less commonly used
media:
'executive-white': Specifies the white executive medium
'folio-white': Specifies the folio white medium
'invoice-white': Specifies the white invoice medium
'ledger-white': Specifies the white ledger medium
'quarto-white': Specified the white quarto medium
'iso-a0-white': Specifies the ISO A0 white medium: 841 mm x 1189 mm
'iso-a0-transparent': Specifies the ISO A0 transparent medium: 841 mm
x 1189 mm
'iso-a0-translucent': Specifies the ISO A0 translucent medium: 841 mm
x 1189 mm
'iso-a1-white': Specifies the ISO A1 white medium: 594 mm x 841 mm
'iso-a1-transparent': Specifies the ISO A1 transparent medium: 594 mm
x 841 mm
'iso-a1-translucent': Specifies the ISO A1 translucent medium: 594 mm
x 841 mm
'iso-a2-white': Specifies the ISO A2 white medium: 420 mm x 594 mm
Hastings, et al. Standards Track [Page 191]
RFC 2911 IPP/1.1: Model and Semantics September 2000
'iso-a2-transparent': Specifies the ISO A2 transparent medium: 420 mm
x 594 mm
'iso-a2-translucent': Specifies the ISO A2 translucent medium: 420 mm
x 594 mm
'iso-a3-transparent': Specifies the ISO A3 transparent medium: 297 mm
x 420 mm
'iso-a3-translucent': Specifies the ISO A3 translucent medium: 297 mm
x 420 mm
'iso-a4-translucent': Specifies the ISO A4 translucent medium: 210 mm
x 297 mm
'iso-a5-transparent': Specifies the ISO A5 transparent medium: 148 mm
x 210 mm
'iso-a5-translucent': Specifies the ISO A5 translucent medium: 148 mm
x 210 mm
'iso-a6-white': Specifies the ISO A6 white medium: 105 mm x 148 mm
'iso-a7-white': Specifies the ISO A7 white medium: 74 mm x 105 mm
'iso-a8-white': Specifies the ISO A8 white medium: 52 mm x 74 mm
'iso-a9-white': Specifies the ISO A9 white medium: 37 mm x 52 mm
'iso-a10-white': Specifies the ISO A10 white medium: 26 mm x 37 mm
'iso-b0-white': Specifies the ISO B0 white medium: 1000 mm x 1414 mm
'iso-b1-white': Specifies the ISO B1 white medium: 707 mm x 1000 mm
'iso-b2-white': Specifies the ISO B2 white medium: 500 mm x 707 mm
'iso-b3-white': Specifies the ISO B3 white medium: 353 mm x 500 mm
'iso-b6-white': Specifies the ISO B6 white medium: 125 mm x 176 mm
'iso-b7-white': Specifies the ISO B7 white medium: 88 mm x 125 mm
'iso-b8-white': Specifies the ISO B8 white medium: 62 mm x 88 mm
'iso-b9-white': Specifies the ISO B9 white medium: 44 mm x 62 mm
'iso-b10-white': Specifies the ISO B10 white medium: 31 mm x 44 mm
'jis-b0-white': Specifies the JIS B0 white medium: 1030 mm x 1456 mm
'jis-b0-transparent': Specifies the JIS B0 transparent medium: 1030
mm x 1456 mm
'jis-b0-translucent': Specifies the JIS B0 translucent medium: 1030
mm x 1456 mm
'jis-b1-white': Specifies the JIS B1 white medium: 728 mm x 1030 mm
'jis-b1-transparent': Specifies the JIS B1 transparent medium: 728 mm
x 1030 mm
'jis-b1-translucent': Specifies the JIS B1 translucent medium: 728 mm
x 1030 mm
'jis-b2-white': Specifies the JIS B2 white medium: 515 mm x 728 mm
'jis-b2-transparent': Specifies the JIS B2 transparent medium: 515 mm
x 728 mm
'jis-b2-translucent': Specifies the JIS B2 translucent medium: 515 mm
x 728 mm
'jis-b3-white': Specifies the JIS B3 white medium: 364 mm x 515 mm
'jis-b3-transparent': Specifies the JIS B3 transparent medium: 364 mm
x 515 mm
'jis-b3-translucent': Specifies the JIS B3 translucent medium: 364 mm
x 515 mm
Hastings, et al. Standards Track [Page 192]
RFC 2911 IPP/1.1: Model and Semantics September 2000
'jis-b4-transparent': Specifies the JIS B4 transparent medium: 257 mm
x 364 mm
'jis-b4-translucent': Specifies the JIS B4 translucent medium: 257 mm
x 364 mm
'jis-b5-transparent': Specifies the JIS B5 transparent medium: 182 mm
x 257 mm
'jis-b5-translucent': Specifies the JIS B5 translucent medium: 182 mm
x 257 mm
'jis-b6-white': Specifies the JIS B6 white medium: 128 mm x 182 mm
'jis-b7-white': Specifies the JIS B7 white medium: 91 mm x 128 mm
'jis-b8-white': Specifies the JIS B8 white medium: 64 mm x 91 mm
'jis-b9-white': Specifies the JIS B9 white medium: 45 mm x 64 mm
'jis-b10-white': Specifies the JIS B10 white medium: 32 mm x 45 mm
The following standard values are defined for American Standard (i.e.
ANSI) engineering media:
'a-white': Specifies the engineering ANSI A size white medium: 8.5
inches x 11 inches
'a-transparent': Specifies the engineering ANSI A size transparent
medium: 8.5 inches x 11 inches
'a-translucent': Specifies the engineering ANSI A size translucent
medium: 8.5 inches x 11 inches
'b-white': Specifies the engineering ANSI B size white medium: 11
inches x 17 inches
'b-transparent': Specifies the engineering ANSI B size transparent
medium: 11 inches x 17 inches)
'b-translucent': Specifies the engineering ANSI B size translucent
medium: 11 inches x 17 inches
'c-white': Specifies the engineering ANSI C size white medium: 17
inches x 22 inches
'c-transparent': Specifies the engineering ANSI C size transparent
medium: 17 inches x 22 inches
'c-translucent': Specifies the engineering ANSI C size translucent
medium: 17 inches x 22 inches
'd-white': Specifies the engineering ANSI D size white medium: 22
inches x 34 inches
'd-transparent': Specifies the engineering ANSI D size transparent
medium: 22 inches x 34 inches
'd-translucent': Specifies the engineering ANSI D size translucent
medium: 22 inches x 34 inches
'e-white': Specifies the engineering ANSI E size white medium: 34
inches x 44 inches
'e-transparent': Specifies the engineering ANSI E size transparent
medium: 34 inches x 44 inches
'e-translucent': Specifies the engineering ANSI E size translucent
medium: 34 inches x 44 inches
Hastings, et al. Standards Track [Page 193]
RFC 2911 IPP/1.1: Model and Semantics September 2000
The following standard values are defined for American Standard (i.e.
ANSI) engineering media for devices that provide the "synchro-cut"
feature (see section 14.1):
'axsynchro-white': Specifies the roll paper having the width of the
longer edge (11 inches) of the engineering ANSI A size white medium
and cuts synchronizing with data.
'axsynchro-transparent': Specifies the roll paper having the width of
the longer edge (11 inches) of the engineering ANSI A size
transparent medium and cuts synchronizing with data.
'axsynchro-translucent': Specifies the roll paper having the width of
the longer edge (11 inches) of the engineering ANSI A size
translucent medium and cuts synchronizing with data.
'bxsynchro-white': Specifies the roll paper having the width of the
longer edge (17 inches) of the engineering ANSI B size white medium
and cuts synchronizing with data.
'bxsynchro-transparent': Specifies the roll paper having the width of
the longer edge (17 inches) of the engineering ANSI B size
transparent medium and cuts synchronizing with data.
'bxsynchro-translucent': Specifies the roll paper having the width of
the longer edge (17 inches) of the engineering ANSI B size
translucent medium and cuts synchronizing with data.
'cxsynchro-white': Specifies the roll paper having the width of the
longer edge (22 inches) of the engineering ANSI C size white medium
and cuts synchronizing with data.
'cxsynchro-transparent': Specifies the roll paper having the width of
the longer edge (22 inches) of the engineering ANSI C size
transparent medium and cuts synchronizing with data.
'cxsynchro-translucent': Specifies the roll paper having the width of
the longer edge (22 inches) of the engineering ANSI C size
translucent medium and cuts synchronizing with data.
'dxsynchro-white': Specifies the roll paper having the width of the
longer edge (34 inches) of the engineering ANSI D size white medium
and cuts synchronizing with data.
'dxsynchro-transparent': Specifies the roll paper having the width of
the longer edge (34 inches) of the engineering ANSI D size
transparent medium and cuts synchronizing with data.
'dxsynchro-translucent': Specifies the roll paper having the width of
the longer edge (34 inches) of the engineering ANSI D size
translucent medium and cuts synchronizing with data.
'exsynchro-white': Specifies the roll paper having the width of the
longer edge (44 inches) of the engineering ANSI E size white medium
and cuts synchronizing with data.
'exsynchro-transparent': Specifies the roll paper having the width of
the longer edge (44 inches) of the engineering ANSI E size
transparent medium and cuts synchronizing with data.
Hastings, et al. Standards Track [Page 194]
RFC 2911 IPP/1.1: Model and Semantics September 2000
'exsynchro-translucent': Specifies the roll paper having the width of
the longer edge (44 inches) of the engineering ANSI E size
translucent medium and cuts synchronizing with data.
The following standard values are defined for American Architectural
engineering media:
'arch-a-white': Specifies the Architectural A size white medium: 9
inches x 12 inches
'arch-a-transparent': Specifies the Architectural A size transparent
medium: 9 inches x 12 inches
'arch-a-translucent': Specifies the Architectural A size translucent
medium: 9 inches x 12 inches
'arch-b-white': Specifies the Architectural B size white medium: 12
inches x 18 inches
'arch-b-transparent': Specifies the Architectural B size transparent
medium: 12 inches x 18 inches
'arch-b-translucent': Specifies the Architectural B size translucent
medium: 12 inches x 18 inches
'arch-c-white': Specifies the Architectural C size white medium: 18
inches x 24 inches
'arch-c-transparent': Specifies the Architectural C size transparent
medium: 18 inches x 24 inches
'arch-c-translucent': Specifies the Architectural C size translucent
medium: 18 inches x 24 inches
'arch-d-white': Specifies the Architectural D size white medium: 24
inches x 36 inches
'arch-d-transparent': Specifies the Architectural D size transparent
medium: 24 inches x 36 inches
'arch-d-translucent': Specifies the Architectural D size translucent
medium: 24 inches x 36 inches
'arch-e-white': Specifies the Architectural E size white medium: 36
inches x 48 inches
'arch-e-transparent': Specifies the Architectural E size transparent
medium: 36 inches x 48 inches
'arch-e-translucent': Specifies the Architectural E size translucent
medium: 36 inches x 48 inches
The following standard values are defined for American Architectural
engineering media for devices that provide the "synchro-cut" feature
(see section 14.1):
'arch-axsynchro-white': Specifies the roll paper having the width of
the longer edge (12 inches) of the Architectural A size white
medium and cuts synchronizing with data.
'arch-axsynchro-transparent': Specifies the roll paper having the
width of the longer edge (12 inches) of the Architectural A size
transparent medium and cuts synchronizing with data.
Hastings, et al. Standards Track [Page 195]
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'arch-axsynchro-translucent': Specifies the roll paper having the
width of the longer edge (12 inches) of the Architectural A size
translucent medium and cuts synchronizing with data.
'arch-bxsynchro-white': Specifies the roll paper having the width of
the longer edge (18 inches) of the Architectural B size white
medium and cuts synchronizing with data.
'arch-bxsynchro-transparent': Specifies the roll paper having the
width of the longer edge (18 inches) of the Architectural B size
transparent medium and cuts synchronizing with data.
'arch-bxsynchro-translucent': Specifies the roll paper having the
width of the longer edge (18 inches) of the Architectural B size
translucent medium and cuts synchronizing with data.
'arch-cxsynchro-white': Specifies the roll paper having the width of
the longer edge (24 inches) of the Architectural C size white
medium and cuts synchronizing with data.
'arch-cxsynchro-transparent': Specifies the roll paper having the
width of the longer edge (24 inches) of the Architectural C size
transparent medium and cuts synchronizing with data.
'arch-cxsynchro-translucent': Specifies the roll paper having the
width of the longer edge (24 inches) of the Architectural C size
translucent medium and cuts synchronizing with data.
'arch-dxsynchro-white': Specifies the roll paper having the width of
the longer edge (36 inches) of the Architectural D size white
medium and cuts synchronizing with data.
'arch-dxsynchro-transparent': Specifies the roll paper having the
width of the longer edge (36 inches) of the Architectural D size
transparent medium and cuts synchronizing with data.
'arch-dxsynchro-translucent': Specifies the roll paper having the
width of the longer edge (36 inches) of the Architectural D size
translucent medium and cuts synchronizing with data.
'arch-exsynchro-white': Specifies the roll paper having the width of
the longer edge (48 inches) of the Architectural E size white
medium and cuts synchronizing with data.
'arch-exsynchro-transparent': Specifies the roll paper having the
width of the longer edge (48 inches) of the Architectural E size
transparent medium and cuts synchronizing with data.
'arch-exsynchro-translucent': Specifies the roll paper having the
width of the longer edge (48 inches) of the Architectural E size
translucent medium and cuts synchronizing with data.
The following standard values are defined for Japanese and European
Standard (i.e. ISO) engineering media, which are of a long fixed size
[ASME-Y14.1M]:
'iso-a1x3-white': Specifies the ISO A1X3 white medium having the
width of the longer edge (841 mm) of the ISO A1 medium
Hastings, et al. Standards Track [Page 196]
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'iso-a1x3-transparent': Specifies the ISO A1X3 transparent medium
having the width of the longer edge (841 mm) of the ISO A1
medium
'iso-a1x3-translucent': Specifies the ISO A1X3 translucent medium
having the width of the longer edge (841 mm) of the ISO A1
medium
'iso-a1x4-white': Specifies the ISO A1X4 white medium having the
width of the longer edge (841 mm) of the ISO A1 medium
'iso-a1x4-transparent': Specifies the ISO A1X4 transparent medium
having the width of the longer edge (841 mm) of the ISO A1
medium
'iso-a1x4- translucent': Specifies the ISO A1X4 translucent medium
having the width of the longer edge (841 mm) of the ISO A1
medium
'iso-a2x3-white': Specifies the ISO A2X3 white medium having the
width of the longer edge (594 mm) of the ISO A2 medium
'iso-a2x3-transparent': Specifies the ISO A2X3 transparent medium
having the width of the longer edge (594 mm) of the ISO A2
medium
'iso-a2x3-translucent': Specifies the ISO A2X3 translucent medium
having the width of the longer edge (594 mm) of the ISO A2
medium
'iso-a2x4-white': Specifies the ISO A2X4 white medium having the
width of the longer edge (594 mm) of the ISO A2 medium
'iso-a2x4-transparent': Specifies the ISO A2X4 transparent medium
having the width of the longer edge (594 mm) of the ISO A2
medium
'iso-a2x4-translucent': Specifies the ISO A2X4 translucent medium
having the width of the longer edge (594 mm) of the ISO A2
medium
'iso-a2x5-white': Specifies the ISO A2X5 white medium having the
width of the longer edge (594 mm) of the ISO A2 medium
'iso-a2x5-transparent': Specifies the ISO A2X5 transparent medium
having the width of the longer edge (594 mm) of the ISO A2
medium
'iso-a2x5-translucent': Specifies the ISO A2X5 translucent medium
having the width of the longer edge (594 mm) of the ISO A2
medium
'iso-a3x3-white': Specifies the ISO A3X3 white medium having the
width of the longer edge (420 mm) of the ISO A3 medium
'iso-a3x3-transparent': Specifies the ISO A3X3 transparent medium
having the width of the longer edge (420 mm) of the ISO A3
medium
'iso-a3x3-translucent': Specifies the ISO A3X3 translucent medium
having the width of the longer edge (420 mm) of the ISO A3
medium
'iso-a3x4-white': Specifies the ISO A3X4 white medium having the
width of the longer edge (420 mm) of the ISO A3 medium
Hastings, et al. Standards Track [Page 197]
RFC 2911 IPP/1.1: Model and Semantics September 2000
'iso-a3x4-transparent': Specifies the ISO A3X4 transparent medium
having the width of the longer edge (420 mm) of the ISO A3
medium
'iso-a3x4-translucent': Specifies the ISO A3X4 translucent medium
having the width of the longer edge (420 mm) of the ISO A3
medium
'iso-a3x5-white': Specifies the ISO A3X5 white medium having the
width of the longer edge (420 mm) of the ISO A3 medium
'iso-a3x5-transparent': Specifies the ISO A3X5 transparent medium
having the width of the longer edge (420 mm) of the ISO A3
medium
'iso-a3x5-translucent': Specifies the ISO A3X5 translucent medium
having the width of the longer edge (420 mm) of the ISO A3
medium
'iso-a3x6-white': Specifies the ISO A3X6 white medium having the
width of the longer edge (420 mm) of the ISO A3 medium
'iso-a3x6-transparent': Specifies the ISO A3X6 transparent medium
having the width of the longer edge (420 mm) of the ISO A3
medium
'iso-a3x6-translucent': Specifies the ISO A3X6 translucent medium
having the width of the longer edge (420 mm) of the ISO A3
medium
'iso-a3x7-white': Specifies the ISO A3X7 white medium having the
width of the longer edge (420 mm) of the ISO A3 medium
'iso-a3x7-transparent': Specifies the ISO A3X7 transparent medium
having the width of the longer edge (420 mm) of the ISO A3
medium
'iso-a3x7-translucent'': Specifies the ISO A3X7 translucent' medium
having the width of the longer edge (420 mm) of the ISO A3
medium
'iso-a4x3-white': Specifies the ISO A4X3 white medium having the
width of the longer edge (297 mm) of the ISO A4 medium
'iso-a4x3-transparent': Specifies the ISO A4X3 transparent medium
having the width of the longer edge (297 mm) of the ISO A4
medium
'iso-a4x3-translucent'': Specifies the ISO A4X3 translucent' medium
having the width of the longer edge (297 mm) of the ISO A4
medium
'iso-a4x4-white': Specifies the ISO A4X4 white medium having the
width of the longer edge (297 mm) of the ISO A4 medium
'iso-a4x4-transparent': Specifies the ISO A4X4 transparent medium
having the width of the longer edge (297 mm) of the ISO A4
medium
'iso-a4x4-translucent': Specifies the ISO A4X4 translucent medium
having the width of the longer edge (297 mm) of the ISO A4
medium
'iso-a4x5-white': Specifies the ISO A4X5 white medium having the
width of the longer edge (297 mm) of the ISO A4 medium
Hastings, et al. Standards Track [Page 198]
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'iso-a4x5-transparent': Specifies the ISO A4X5 transparent medium
having the width of the longer edge (297 mm) of the ISO A4
medium
'iso-a4x5-translucent': Specifies the ISO A4X5 translucent medium
having the width of the longer edge (297 mm) of the ISO A4
medium
'iso-a4x6-white': Specifies the ISO A4X6 white medium having the
width of the longer edge (297 mm) of the ISO A4 medium
'iso-a4x6-transparent': Specifies the ISO A4X6 transparent medium
having the width of the longer edge (297 mm) of the ISO A4
medium
'iso-a4x6-translucent': Specifies the ISO A4X6 translucent medium
having the width of the longer edge (297 mm) of the ISO A4
medium
'iso-a4x7-white': Specifies the ISO A4X7 white medium having the
width of the longer edge (297 mm) of the ISO A4 medium
'iso-a4x7-transparent': Specifies the ISO A4X7 transparent medium
having the width of the longer edge (297 mm) of the ISO A4
medium
'iso-a4x7-translucent': Specifies the ISO A4X7 translucent medium
having the width of the longer edge (297 mm) of the ISO A4
medium
'iso-a4x8-white': Specifies the ISO A4X8 white medium having the
width of the longer edge (297 mm) of the ISO A4 medium
'iso-a4x8-transparent': Specifies the ISO A4X8 transparent medium
having the width of the longer edge (297 mm) of the ISO A4
medium
'iso-a4x8-translucent': Specifies the ISO A4X8 translucent medium
having the width of the longer edge (297 mm) of the ISO A4
medium
'iso-a4x9-white': Specifies the ISO A4X9 white medium having the
width of the longer edge (297 mm) of the ISO A4 medium
'iso-a4x9-transparent': Specifies the ISO A4X9 transparent medium
having the width of the longer edge (297 mm) of the ISO A4
medium
'iso-a4x9-translucent': Specifies the ISO A4X9 translucent medium
having the width of the longer edge (297 mm) of the ISO A4
medium
The following standard values are defined for Japanese and European
Standard (i.e. ISO) engineering media, which are either a long fixed
size [ASME-Y14.1M] or roll feed, for devices that provide the
"synchro-cut" feature (see section 14.1):
'iso-a0xsynchro-white': Specifies the paper having the width of the
longer edge (1189 mm) of the ISO A0 white medium and cuts
synchronizing with data.
Hastings, et al. Standards Track [Page 199]
RFC 2911 IPP/1.1: Model and Semantics September 2000
'iso-a0xsynchro-transparent': Specifies the paper having the width of
the longer edge (1189 mm) of the ISO A0 transparent medium and
cuts synchronizing with data.
'iso-a0xsynchro-translucent': Specifies the paper having the width of
the longer edge (1189 mm) of the ISO A0 translucent medium and
cuts synchronizing with data.
'iso-a1xsynchro-white': Specifies the paper having the width of the
longer edge (841 mm) of the ISO A1 white medium and cuts
synchronizing with data.
'iso-a1xsynchro-transparent': Specifies the paper having the width of
the longer edge (841 mm) of the ISO A1 transparent medium and
cuts synchronizing with data.
'iso-a1xsynchro-translucent': Specifies the paper having the width of
the longer edge (841 mm) of the ISO A1 translucent medium and
cuts synchronizing with data.
'iso-a2xsynchro-white': Specifies the paper having the width of the
longer edge (594 mm) of the ISO A2 white medium and cuts
synchronizing with data.
'iso-a2xsynchro-transparent': Specifies the paper having the width of
the longer edge (594 mm) of the ISO A2 transparent medium and
cuts synchronizing with data.
'iso-a2xsynchro-translucent': Specifies the paper having the width of
the longer edge (594 mm) of the ISO A2 translucent medium and
cuts synchronizing with data.
'iso-a3xsynchro-white': Specifies the paper having the width of the
longer edge (420 mm) of the ISO A3 white medium and cuts
synchronizing with data.
'iso-a3xsynchro-transparent': Specifies the paper having the width of
the longer edge (420 mm) of the ISO A3 transparent medium and
cuts synchronizing with data.
'iso-a3xsynchro-translucent': Specifies the paper having the width of
the longer edge (420 mm) of the ISO A3 translucent medium and
cuts synchronizing with data.
'iso-a4xsynchro-white': Specifies the paper having the width of the
longer edge (297 mm) of the ISO A4 white medium and cuts
synchronizing with data.
'iso-a4xsynchro-transparent': Specifies the paper having the width of
the longer edge (297 mm) of the ISO A4 transparent medium and
cuts synchronizing with data.
'iso-a4xsynchro-translucent': Specifies the paper having the width of
the longer edge (297 mm) of the ISO A4 transparent medium and
cuts synchronizing with data.
The following standard values are defined for American Standard (i.e.
ANSI) engineering media, American Architectural engineering media,
and Japanese and European Standard (i.e. ISO) engineering media,
Hastings, et al. Standards Track [Page 200]
RFC 2911 IPP/1.1: Model and Semantics September 2000
which are either a long fixed size [ASME-Y14.1M] or roll feed, for
devices that provide the "synchro-cut" feature and/or the "auto-
select" feature (see section 14.1):
'auto-white': Specifies that the printer selects the white medium
with the appropriate fixed size (e.g. a1, a2, etc.) or data-
synchro size, and the selection is implementation-defined.
'auto-transparent': Specifies that the printer selects the
transparent medium with the appropriate fixed size (e.g. a1, a2,
etc.) or data-synchro size, and the selection is implementation-
defined.
'auto-translucent': Specifies that the printer selects the
translucent medium with the appropriate fixed size (e.g. a1, a2,
etc.) or data-synchro size, and the selection is implementation-
defined.
'auto-fixed-size-white': Specifies that the printer selects the white
medium with the appropriate fixed size (e.g. a1, a2, etc.) or
the appropriate long fixed size listed above.
'auto-fixed-size-transparent': Specifies that the printer selects the
transparent medium with the appropriate fixed size (e.g. a1, a2,
etc.) or the appropriate long fixed size listed above.
'auto-fixed-size-translucent': Specifies that the printer selects the
translucent medium with the appropriate fixed size (e.g. a1, a2,
etc.) or the appropriate long fixed size listed above.
'auto-synchro-white': Specifies that the printer selects the white
paper with the appropriate width and cuts it synchronizing with
data.
'auto-synchro-transparent': Specifies that the printer selects the
transparent paper with the appropriate width and cuts it
synchronizing with data.
'auto-synchro-translucent': Specifies that the printer selects the
translucent paper with the appropriate width and cuts it
synchronizing with data.
The following standard values are defined for input-trays (from ISO
DPA and the Printer MIB):
'top': The top input tray in the printer.
'middle': The middle input tray in the printer.
'bottom': The bottom input tray in the printer.
'envelope': The envelope input tray in the printer.
'manual': The manual feed input tray in the printer.
'large-capacity': The large capacity input tray in the printer.
'main': The main input tray
'side': The side input tray
Hastings, et al. Standards Track [Page 201]
RFC 2911 IPP/1.1: Model and Semantics September 2000
The following standard values are defined for media sizes (from ISO
DPA):
'iso-a0': Specifies the ISO A0 size: 841 mm by 1189 mm as defined in
ISO 216
'iso-a1': Specifies the ISO A1 size: 594 mm by 841 mm as defined in
ISO 216
'iso-a2': Specifies the ISO A2 size: 420 mm by 594 mm as defined in
ISO 216
'iso-a3': Specifies the ISO A3 size: 297 mm by 420 mm as defined in
ISO 216
'iso-a4': Specifies the ISO A4 size: 210 mm by 297 mm as defined in
ISO 216
'iso-a5': Specifies the ISO A5 size: 148 mm by 210 mm as defined in
ISO 216
'iso-a6': Specifies the ISO A6 size: 105 mm by 148 mm as defined in
ISO 216
'iso-a7': Specifies the ISO A7 size: 74 mm by 105 mm as defined in
ISO 216
'iso-a8': Specifies the ISO A8 size: 52 mm by 74 mm as defined in ISO
216
'iso-a9': Specifies the ISO A9 size: 37 mm by 52 mm as defined in ISO
216
'iso-a10': Specifies the ISO A10 size: 26 mm by 37 mm as defined in
ISO 216
'iso-b0': Specifies the ISO B0 size: 1000 mm by 1414 mm as defined in
ISO 216
'iso-b1': Specifies the ISO B1 size: 707 mm by 1000 mm as defined in
ISO 216
'iso-b2': Specifies the ISO B2 size: 500 mm by 707 mm as defined in
ISO 216
'iso-b3': Specifies the ISO B3 size: 353 mm by 500 mm as defined in
ISO 216
'iso-b4': Specifies the ISO B4 size: 250 mm by 353 mm as defined in
ISO 216
'iso-b5': Specifies the ISO B5 size: 176 mm by 250 mm as defined in
ISO 216
'iso-b6': Specifies the ISO B6 size: 125 mm by 176 mm as defined in
ISO 216
'iso-b7': Specifies the ISO B7 size: 88 mm by 125 mm as defined in
ISO 216
'iso-b8': Specifies the ISO B8 size: 62 mm by 88 mm as defined in ISO
216
'iso-b9': Specifies the ISO B9 size: 44 mm by 62 mm as defined in ISO
216
'iso-b10': Specifies the ISO B10 size: 31 mm by 44 mm as defined in
ISO 216
Hastings, et al. Standards Track [Page 202]
RFC 2911 IPP/1.1: Model and Semantics September 2000
'na-letter': Specifies the North American letter size: 8.5 inches by
11 inches
'na-legal': Specifies the North American legal size: 8.5 inches by 14
inches
'na-8x10': Specifies the North American 8 inches by 10 inches
'na-5x7': Specifies the North American 5 inches by 7 inches
'executive': Specifies the executive size (7.25 X 10.5 in)
'folio': Specifies the folio size (8.5 X 13 in)
'invoice': Specifies the invoice size (5.5 X 8.5 in)
'ledger': Specifies the ledger size (11 X 17 in)
'quarto': Specifies the quarto size (8.5 X 10.83 in)
'iso-c3': Specifies the ISO C3 size: 324 mm by 458 mm as defined in
ISO 269
'iso-c4': Specifies the ISO C4 size: 229 mm by 324 mm as defined in
ISO 269
'iso-c5': Specifies the ISO C5 size: 162 mm by 229 mm as defined in
ISO 269
'iso-c6': Specifies the ISO C6 size: 114 mm by 162 mm as defined in
ISO 269
'iso-designated-long': Specifies the ISO Designated Long size: 110 mm
by 220 mm as defined in ISO 269
'na-10x13-envelope': Specifies the North American 10x13 size: 10
inches by 13 inches
'na-9x12-envelope': Specifies the North American 9x12 size: 9 inches
by 12 inches
'na-number-10-envelope': Specifies the North American number 10
business envelope size: 4.125 inches by 9.5 inches
'na-7x9-envelope': Specifies the North American 7x9 inch envelope
size
'na-9x11-envelope': Specifies the North American 9x11 inch envelope
size
'na-10x14-envelope': Specifies the North American 10x14 inch envelope
size
'na-number-9-envelope': Specifies the North American number 9
business envelope size
'na-6x9-envelope': Specifies the North American 6x9 envelope size
'na-10x15-envelope': Specifies the North American 10x15 envelope size
'monarch-envelope': Specifies the Monarch envelope size (3.87 x 7.5
in)
'jis-b0': Specifies the JIS B0 size: 1030mm x 1456mm
'jis-b1': Specifies the JIS B1 size: 728mm x 1030mm
'jis-b2': Specifies the JIS B2 size: 515mm x 728mm
'jis-b3': Specifies the JIS B3 size: 364mm x 515mm
'jis-b4': Specifies the JIS B4 size: 257mm x 364mm
'jis-b5': Specifies the JIS B5 size: 182mm x 257mm
'jis-b6': Specifies the JIS B6 size: 128mm x 182mm
'jis-b7': Specifies the JIS B7 size: 91mm x 128mm
'jis-b8': Specifies the JIS B8 size: 64mm x 91mm
Hastings, et al. Standards Track [Page 203]
RFC 2911 IPP/1.1: Model and Semantics September 2000
'jis-b9': Specifies the JIS B9 size: 45mm x 64mm
'jis-b10': Specifies the JIS B10 size: 32mm x 45mm
The following standard values are defined for American Standard (i.e.
ANSI) engineering media sizes:
'a': Specifies the engineering ANSI A size medium: 8.5 inches x 11
inches
'b': Specifies the engineering ANSI B size medium: 11 inches x 17
inches
'c': Specifies the engineering ANSI C size medium: 17 inches x 22
inches
'd': Specifies the engineering ANSI D size medium: 22 inches x 34
inches
'e': Specifies the engineering ANSI E size medium: 34 inches x 44
inches
The following standard values are defined for American Architectural
engineering media sizes:
'arch-a': Specifies the Architectural A size medium: 9 inches x 12
inches
'arch-b': Specifies the Architectural B size medium: 12 inches x 18
inches
'arch-c': Specifies the Architectural C size medium: 18 inches x 24
inches
'arch-d': Specifies the Architectural D size medium: 24 inches x 36
inches
'arch-e': Specifies the Architectural E size medium: 36 inches x 48
inches
Hastings, et al. Standards Track [Page 204]
RFC 2911 IPP/1.1: Model and Semantics September 2000
When submitting a print job to a Printer object, the IPP model allows
a client to supply operation and Job Template attributes along with
the document data. These Job Template attributes in the create
request affect the rendering, production and finishing of the
documents in the job. Similar types of instructions may also be
contained in the document to be printed, that is, embedded within the
print data itself. In addition, the Printer has a set of attributes
that describe what rendering and finishing options which are
supported by that Printer. This model, which allows for flexibility
and power, also introduces the potential that at job submission time,
these client-supplied attributes may conflict with either:
- what the implementation is capable of realizing (i.e., what the
Printer supports), as well as
- the instructions embedded within the print data itself.
Hastings, et al. Standards Track [Page 208]
RFC 2911 IPP/1.1: Model and Semantics September 2000
The following sections describe how these two types of conflicts are
handled in the IPP model.
If there is a conflict between what the client requests and what a
Printer object supports, the client may request one of two possible
conflict handling mechanisms:
1) either reject the job since the job can not be processed
exactly as specified, or
2) allow the Printer to make any changes necessary to proceed with
processing the Job the best it can.
In the first case the client is indicating to the Printer object:
"Print the job exactly as specified with no exceptions, and if that
can't be done, don't even bother printing the job at all." In the
second case, the client is indicating to the Printer object: "It is
more important to make sure the job is printed rather than be
processed exactly as specified; just make sure the job is printed
even if some client-supplied attributes need to be changed or
ignored."
The IPP model accounts for this situation by introducing an "ipp-
attribute-fidelity" attribute.
In a create request, "ipp-attribute-fidelity" is a boolean operation
attribute that is OPTIONALLY supplied by the client. The value
'true' indicates that total fidelity to client supplied Job Template
attributes and values is required. The client is requesting that the
Job be printed exactly as specified, and if that is not possible then
the job MUST be rejected rather than processed incorrectly. The
value 'false' indicates that a reasonable attempt to print the Job is
acceptable. If a Printer does not support some of the client
supplied Job Template attributes or values, the Printer MUST ignore
them or substitute any supported value for unsupported values,
respectively. The Printer may choose to substitute the default value
associated with that attribute, or use some other supported value
that is similar to the unsupported requested value. For example, if
a client supplies a "media" value of 'na-letter', the Printer may
choose to substitute 'iso-a4' rather than a default value of
'envelope'. If the client does not supply the "ipp-attribute-
fidelity" attribute, the Printer assumes a value of 'false'.
Each Printer implementation MUST support both types of "fidelity"
printing (that is whether the client supplies a value of 'true' or
'false'):
Hastings, et al. Standards Track [Page 209]
RFC 2911 IPP/1.1: Model and Semantics September 2000
- If the client supplies 'false' or does not supply the attribute,
the Printer object MUST always accept the request by ignoring
unsupported Job Template attributes and by substituting
unsupported values of supported Job Template attributes with
supported values.
- If the client supplies 'true', the Printer object MUST reject
the request if the client supplies unsupported Job Template
attributes.
Since a client can always query a Printer to find out exactly what is
and is not supported, "ipp-attribute-fidelity" set to 'false' is
useful when:
1) The End-User uses a command line interface to request
attributes that might not be supported.
2) In a GUI context, if the End User expects the job might be
moved to another printer and prefers a sub-optimal result to
nothing at all.
3) The End User just wants something reasonable in lieu of nothing
at all.
If there is a conflict between the value of an IPP Job Template
attribute and a corresponding instruction in the document data, the
value of the IPP attribute SHOULD take precedence over the document
instruction. Consider the case where a previously formatted file of
document data is sent to an IPP Printer. In this case, if the client
supplies any attributes at job submission time, the client desires
that those attributes override the embedded instructions. Consider
the case were a previously formatted document has embedded in it
commands to load 'iso-a4' media. However, the document is passed to
an end user that only has access to a printer with 'na-letter' media
loaded. That end user most likely wants to submit that document to
an IPP Printer with the "media" Job Template attribute set to 'na-
letter'. The job submission attribute should take precedence over
the embedded PDL instruction. However, until companies that supply
document data interpreters allow a way for external IPP attributes to
take precedence over embedded job production instructions, a Printer
might not be able to support the semantics that IPP attributes
override the embedded instructions.
The IPP model accounts for this situation by introducing a "pdl-
override-supported" attribute that describes the Printer objects
capabilities to override instructions embedded in the PDL data
stream. The value of the "pdl-override-supported" attribute is
configured by means outside the scope of this IPP/1.1 document.
Hastings, et al. Standards Track [Page 210]
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This REQUIRED Printer attribute takes on the following values:
- 'attempted': This value indicates that the Printer object
attempts to make the IPP attribute values take precedence over
embedded instructions in the document data, however there is no
guarantee.
- 'not-attempted': This value indicates that the Printer object
makes no attempt to make the IPP attribute values take
precedence over embedded instructions in the document data.
At job processing time, an implementation that supports the value of
'attempted' might do one of several different actions:
1) Generate an output device specific command sequence to realize
the feature represented by the IPP attribute value.
2) Parse the document data itself and replace the conflicting
embedded instruction with a new embedded instruction that
matches the intent of the IPP attribute value.
3) Indicate to the Printer that external supplied attributes take
precedence over embedded instructions and then pass the
external IPP attribute values to the document data interpreter.
4) Anything else that allows for the semantics that IPP attributes
override embedded document data instructions.
Since 'attempted' does not offer any type of guarantee, even though a
given Printer object might not do a very "good" job of attempting to
ensure that IPP attributes take a higher precedence over instructions
embedded in the document data, it would still be a conforming
implementation.
At job processing time, an implementation that supports the value of
'not-attempted' might do one of the following actions:
1) Simply pre-pend the document data with the PDL instruction that
corresponds to the client-supplied PDL attribute, such that if
the document data also has the same PDL instruction, it will
override what the Printer object pre-pended. In other words,
this implementation is using the same implementation semantics
for the client-supplied IPP attributes as for the Printer
object defaults.
2) Parse the document data and replace the conflicting embedded
instruction with a new embedded instruction that approximates,
but does not match, the semantic intent of the IPP attribute
value.
Note: The "ipp-attribute-fidelity" attribute applies to the
Printer's ability to either accept or reject other unsupported Job
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Template attributes. In other words, if "ipp-attribute-fidelity" is
set to 'true', a Job is accepted if and only if the client supplied
Job Template attributes and values are supported by the Printer.
Whether these attributes actually affect the processing of the Job
when the document data contains embedded instructions depends on the
ability of the Printer to override the instructions embedded in the
document data with the semantics of the IPP attributes. If the
document data attributes can be overridden ("pdl-override-supported"
set to 'attempted'), the Printer makes an attempt to use the IPP
attributes when processing the Job. If the document data attributes
can not be overridden ("pdl-override-supported" set to 'not-
attempted'), the Printer makes no attempt to override the embedded
document data instructions with the IPP attributes when processing
the Job, and hence, the IPP attributes may fail to affect the Job
processing and output when the corresponding instruction is embedded
in the document data.
The Printer object uses some of the Job object's Job Template
attributes during the processing of the document data associated with
that job. These include, but are not limited to, "orientation-
requested", "number-up", "sides", "media", and "copies". The
processing of each document in a Job Object MUST follow the steps
below. These steps are intended only to identify when and how
attributes are to be used in processing document data and any
alternative steps that accomplishes the same effect can be used to
implement this specification document.
1. Using the client supplied "document-format" attribute or some
form of document format detection algorithm (if the value of
"document-format" is not specific enough), determine whether or
not the document data has already been formatted for printing.
If the document data has been formatted, then go to step 2.
Otherwise, the document data MUST be formatted. The formatting
detection algorithm is implementation defined and is not
specified by this document. The formatting of the document
data uses the "orientation-requested" attribute to determine
how the formatted print data should be placed on a print-stream
page, see section 4.2.10 for the details.
2. The document data is in the form of a print-stream in a known
media type. The "page-ranges" attribute is used to select, as
specified in section 4.2.7, a sub-sequence of the pages in the
print-stream that are to be processed and images.
3. The input to this step is a sequence of print-stream pages.
This step is controlled by the "number-up" attribute. If the
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value of "number-up" is N, then during the processing of the
print-stream pages, each N print-stream pages are positioned,
as specified in section 4.2.9, to create a single impression.
If a given document does not have N more print-stream pages,
then the completion of the impression is controlled by the
"multiple-document-handling" attribute as described in section
4.2.4; when the value of this attribute is 'single-document' or
'single-document-new-sheet', the print-stream pages of document
data from subsequent documents is used to complete the
impression.
The size(scaling), position(translation) and rotation of the
print-stream pages on the impression is implementation defined.
Note that during this process the print-stream pages may be
rendered to a form suitable for placing on the impression; this
rendering is controlled by the values of the "printer-
resolution" and "print-quality" attributes as described in
sections 4.2.12 and 4.2.13. In the case N=1, the impression is
nearly the same as the print-stream page; the differences would
only be in the size, position and rotation of the print-stream
page and/or any decoration, such as a frame to the page, that
is added by the implementation.
4. The collection of impressions is placed, in sequence, onto
sides of the media sheets. This placement is controlled by the
"sides" attribute and the orientation of the print-stream page,
as described in section 4.2.8. The orientation of the print-
stream pages affects the orientation of the impression; for
example, if "number-up" equals 2, then, typically, two portrait
print-stream pages become one landscape impression. Note that
the placement of impressions onto media sheets is also
controlled by the "multiple-document-handling" attribute as
described in section 4.2.4.
5. The "copies" and "multiple-document-handling" attributes are
used to determine how many copies of each media instance are
created and in what order. See sections 4.2.5 and 4.2.4 for the
details.
6. When the correct number of copies are created, the media
instances are finished according to the values of the
"finishings" attribute as described in 4.2.6. Note that
sometimes finishing operations may require manual intervention
to perform the finishing operations on the copies, especially
uncollated copies. This document allows any or all of the
processing steps to be performed automatically or manually at
the discretion of the Printer object.
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This section defines a generic schema for an entry in a directory
service. A directory service is a means by which service users can
locate service providers. In IPP environments, this means that IPP
Printers can be registered (either automatically or with the help of
an administrator) as entries of type printer in the directory using
an implementation specific mechanism such as entry attributes, entry
type fields, specific branches, etc. Directory clients can search or
browse for entries of type printer. Clients use the directory
service to find entries based on naming, organizational contexts, or
filtered searches on attribute values of entries. For example, a
client can find all printers in the "Local Department" context.
Authentication and authorization are also often part of a directory
service so that an administrator can place limits on end users so
that they are only allowed to find entries to which they have certain
access rights. IPP itself does not require any specific directory
service protocol or provider.
Note: Some directory implementations allow for the notion of
"aliasing". That is, one directory entry object can appear as
multiple directory entry object with different names for each object.
In each case, each alias refers to the same directory entry object
which refers to a single IPP Printer object.
The generic schema is a subset of IPP Printer Job Template and
Printer Description attributes (sections 4.2 and 4.4). These
attributes are identified as either RECOMMENDED or OPTIONAL for the
directory entry itself. This conformance labeling is NOT the same
conformance labeling applied to the attributes of IPP Printers
objects. The conformance labeling in this Appendix is intended to
apply to directory templates and to IPP Printer implementations that
subscribe by adding one or more entries to a directory. RECOMMENDED
attributes SHOULD be associated with each directory entry. OPTIONAL
attributes MAY be associated with the directory entry (if known or
supported). In addition, all directory entry attributes SHOULD
reflect the current attribute values for the corresponding Printer
object.
The names of attributes in directory schema and entries SHOULD be the
same as the IPP Printer attribute names as shown, as much as
possible.
In order to bridge between the directory service and the IPP Printer
object, one of the RECOMMENDED directory entry attributes is the
Printer object's "printer-uri-supported" attribute. The directory
client queries the "printer-uri-supported" attribute (or its
equivalent) in the directory entry and then the IPP client addresses
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the IPP Printer object using one of its URIs. The "uri-security-
supported" attribute identifies the protocol (if any) used to secure
a channel.
The following attributes define the generic schema for directory
entries of type PRINTER:
printer-uri-supported RECOMMENDED Section 4.4.1
uri-authentication-supported RECOMMENDED Section 4.4.2
uri-security-supported RECOMMENDED Section 4.4.3
printer-name RECOMMENDED Section 4.4.4
printer-location RECOMMENDED Section 4.4.5
printer-info OPTIONAL Section 4.4.6
printer-more-info OPTIONAL Section 4.4.7
printer-make-and-model RECOMMENDED Section 4.4.9
ipp-versions-supported RECOMMENDED Section 4.4.14
multiple-document-jobs-supported OPTIONAL Section 4.4.16
charset-supported OPTIONAL Section 4.4.18
generated-natural-language-
supported OPTIONAL Section 4.4.20
document-format-supported RECOMMENDED Section 4.4.22
color-supported RECOMMENDED Section 4.4.26
compression-supported RECOMMENDED Section 4.4.32
pages-per-minute OPTIONAL Section 4.4.36
pages-per-minute-color OPTIONAL Section 4.4.37
finishings-supported OPTIONAL Section 4.2.6
number-up-supported OPTIONAL Section 4.2.7
sides-supported RECOMMENDED Section 4.2.8
media-supported RECOMMENDED Section 4.2.11
printer-resolution-supported OPTIONAL Section 4.2.12
print-quality-supported OPTIONAL Section 4.2.13
Semantics" Documents
This Appendix is divided into two lists that summarize the
differences between IPP/1.1 (this document) and IPP/1.0 [RFC2566].
The section numbers refer to the numbers in this document which in
some cases have changed from RFC 2566. When a change affects
multiple sections, the item is listed once in the order of the first
section affected and the remaining affected section numbers are
indicated.
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The first list contains extensions and clarifications and the second
list contains changes in semantics or conformance. However, client
and IPP object implementations of IPP/1.0 MAY implement any of the
extensions and clarifications in this document.
The following extensions and clarifications have been incorporated
into this document:
1. Section 2.1 - clarified that the term "client" can be either
contained in software controlled by an end user or a part of a
print server that controls devices.
2. Section 2 - clarified that the term "IPP object" and "Printer
object" can either be embedded in a device object or part of a
print server that accepts IPP requests.
3. Section 2.4 - added the description of the new "uri-
authentication-supported" Printer Description attribute.
4. Section 3.1.3, 3.1.6, 3.2.5.2, and 3.2.6.2 - clarified the
error handling for operation attributes that have their own
status code.
5. Section 3.1.3 - clarified that multiple occurrences of the
same attribute in an attribute group is mal-formed. An IPP
Printer MAY reject the request or choose one of the
attributes.
6. Section 3.1.6 - reorganized this section into sub-sections to
separately describe "status-code", "status-message",
"detailed-status-message", and "document-access-error"
attributes.
7. Section 3.1.6.1 - clarified the error status codes and their
relationship to operation attributes.
8. Section 3.1.6.3 - Added the OPTIONAL "detailed-status-message
(text(MAX))" operation attribute to provide additional more
detailed information about a response.
9. Section 3.1.6.4 and 3.2.2 - Added the OPTIONAL "document-
access-error (text(MAX))" operation attribute for use with
Print-URI and Send-URI responses.
10. Sections 3.1.7 - Added this new section to clarify returning
Unsupported Attributes for all operations, including only
returning attributes that were in the request. Moved the text
from section 3.2.1.2 Unsupported Attributes to this section.
11. Sections 3.1.7 and 4.1 - clarified the encoding of the "out-
of-band" 'unsupported' and 'unknown' values.
12. Section 3.1.8 - clarified that only the version number
parameter will be carried forward into future major or minor
versions of the protocol.
13. Section 3.1.8 - relaxed the requirements to increment the
major version number in future versions of the Model and
Semantics document.
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14. Section 3.1.9, and 3.2.5 - added the 'processing' state to the
list of job states that a job can be in after a Create-Job
operation.
15. Section 3.1.9 - clarified that a non-spooling Printer MAY
accept zero or more subsequent jobs while processing a job and
flow control them down. Subsequent create requests are
rejected with the 'server-error-busy' error status.
16. Section 3.2.1.1 - clarified the validation of the
"compression" operation attribute and its relationship to the
validation of the "document-format" attribute and returning
Unsupported Attributes.
17. Sections 3.2.1.1, 4.3.8, 13.1.4.16, and 13.1.4.17 - added the
'client-error-compression-not-supported', 'client-error-
compression-error' status codes and the 'unsupported-
compression' and 'compression-error' job-state-reasons.
18. Sections 3.2.1.1 and 4.3.8 - added 'unsupported-document-
format' and 'document-format-error' job-state-reasons.
19. Sections 3.2.2, 4.3.8 and 13.1.4.19 - added 'client-error-
document-access-error' status code and 'document-access-error'
job state reason.
20. Section 3.2.5.2 and 3.2.6.2 - clarified that the Unsupported
Attributes group MUST NOT include attributes not requested in
the Get-Printer-Attributes request.
21. Section 3.2.6 - clarified that "limit" takes precedence over
"which-jobs" and "my-jobs'.
22. Section 3.2.6.2 - clarified that Get-Jobs returns
'successful-ok' when no jobs to return.
23. Sections 3.2.7, 3.2.8, and 3.2.9 - added the OPTIONAL Pause-
Printer, Resume-Printer, and Purge-Jobs operations
24. Section 3.3.1 - clarified that the authorization required for
a Send-Document request MUST be the same user as the Create-
Job or an operator.
25. Section 3.3.1.1 - clarified that a Create-Job Send-Document
with "last-document" = 'true' and no data is not an error; its
a job with no documents.
26. Sections 3.3.5, 3.3.6, and 3.3.7 - added the OPTIONAL Hold-
Job, Release-Job, and Restart-Job operations. Clarified the
Restart-Job operation so that the Printer MUST re-fetch any
documents passed by-reference (Print-URI or Send-URI).
27. Section 4.1 - clarified that the encoding of the out-of-band
values are specified in the Encoding and Transport" document.
28. Section 4.1 - Clarified that the requirement that clients MUST
NOT send "out-of-band" values in requests applies only to
operations defined in this document. Other operations are
allowed to define "out-of-band" values that clients can
supply.
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29. Sections 4.1.1 and 4.1.2 - clarified that the maximum 'text'
and 'name' values of 1023 and 255 are for the
'textWithoutLanguage' portion of the 'textWithLanguage' form,
so that the maximum number of octets for the actual text and
name data is the same for the without and with language forms;
the 'naturalLanguage' part is in addition.
30. Section 4.1.9 - clarified that 'mimeMediaType' values can
include any parameters from the IANA Registry, not just
charset parameters.
31. Section 4.1.9.1 - clarified that 'application/octet-stream'
auto-sensing can happen at create request time and/or
job/document processing time.
32. Section 4.1.9.1 - clarified that auto-sensing involves the
Printer examining some number of octets of document data using
an implementation-dependent method.
33. Section 4.1.14 - clarified that the localization of dateTime
by the client includes the time zone.
34. Section 4.2 - clarified that xxx-supported have multiple
keywords and/or names by adding parentheses to the table to
give: (1setOf (type3 keyword | name))
35. Section 4.2.2 - added the 'indefinite' keyword value to the
"job-hold-until" attribute for use with the create operations
and Hold-Job and Restart-Job operations.
36. Section 4.2.6 - added more enum values to the "finishings" Job
Template attribute.
37. Section 4.2.6 - clarified that the landscape definition is a
rotation of the image with respect to the medium.
38. Section 4.3.7 - added that a forwarding server that cannot get
any job state MAY return the job's state as 'completed',
provided that it also return the new 'queued-in-device' job
state reason.
39. Section 4.3.7.2 - added the Partitioning of Job States section
to clarify the concepts of Job Retention, Job History, and Job
Removal.
40. Section 4.3.8 - added 'job-data-insufficient' job state reason
to indicate whether sufficient data has arrived for the
document to start to be processed.
41. Section 4.3.8 - added 'document-access-error' job state reason
to indicate an access error of any kind.
42. Section 4.3.8 - added 'job-queued-for-marker' job state reason
to indicate whether the job has completed some processing and
is waiting for the marker.
43. Section 4.3.8 - added 'unsupported-compression' and
'compression-error' job state reasons to indicate compression
not supported or compression processing error after the create
has been accepted.
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44. Section 4.3.8 - added 'unsupported-document-format' and
'document-format-error' job state reasons to indicate document
not supported or document format processing error after the
create has been accepted.
45. Section 4.3.8 - added 'queued-in-device' job state reason to
indicate that a job as been forwarded to a print system or
device that does not provide any job status.
46. Section 4.3.10 - added "job-detailed-status-messages (1setOf
text(MAX)) for returning detailed error messages.
47. Section 4.3.11 - added the "job-document-access-errors (1setOf
text(MAX))
48. Section 4.3.14.2 - clarified that the time recorded is the
first time processing since the create operation or the
Restart-Job operation.
49. Section 4.3.14.2 and 4.3.14.3 - clarified that the out-of-band
value 'no-value' is returned if the job has not started
processing or has not completed, respectively.
50. Section 4.3.14 - Added the OPTIONAL "date-time-at-creation",
"date-time-at-processing", and "date-time-at-completed" Event
Time Job Description attributes
51. Section 4.4.3 - added the 'tls' value to "uri-security-
supported" attribute.
52. Section 4.4.3 - clarified "uri-security-supported" is
orthogonal to Client Authentication so that 'none' does not
exclude Client Authentication.
53. Section 4.4.11 - simplified the "printer-state" descriptions
while generalizing to allow high end devices that interpret
one or more jobs while marking another. Indicated that
'spool-area-full' and 'stopped-partly' "printer-state-reasons"
may be used to provide further state information.
54. Section 4.4.12 - added the 'moving-to-paused' keyword value to
the "printer-state-reasons" attribute for use with the Pause-
Printer operation.
55. Section 4.4.12 - replaced the duplicate 'marker-supply-low'
keyword with the missing 'toner-empty' keyword for the
"printer-state-reasons" attribute. (This correction was also
made before RFC 2566 was published).
56. Section 4.4.12 - clarified 'spool-area-full' "printer-state-
reasons" to include non-spooling printers to indicate when it
can and cannot accept another job.
57. Section 4.4.15 - added the enum values to the "operations-
supported" attribute for the new operations. Clarified that
the values of this attribute are encoded as any enum, namely
32-bit values.
58. Section 4.4.30 - clarified that the dateTime value of
"printer-current-time" is on a "best efforts basis". If a
proper date-time cannot be obtained, the implementation
returns the 'no-value' out-of-band value. Also clarified that
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the time zone NEED NOT be the time zone that the people near
the device use and that the client SHOULD display the dateTime
attributes in the user's local time.
59. Sections 4.4.36 and 4.4.37 - added the OPTIONAL "pages-per-
minute" and "pages-per-minute-color" Printer Description
attributes.
60. Section 5.1 - clarified that the client conformance
requirements apply to clients controlled by an end user and
clients in servers.
61. Section 5.1 - clarified that any response MAY contain
additional attribute groups, attributes, attribute syntaxes,
or attribute values.
62. Section 5.1 - clarified that a client SHOULD do its best to
prevent a channel from being closed by a lower layer when the
channel is flow controlled off by the IPP Printer.
63. Section 5.2 - clarified that the IPP object requirements apply
to objects embedded in devices or that are parts of servers.
64. Section 5.2.2 - clarified that IPP objects MAY return
operation responses that contain attribute groups, attribute
names, attribute syntaxes, attribute values, and status codes
that are extensions to this standard.
65. Section 6 - changed the terminology of "private extensions" to
"vendor extensions" and indicated that they are registered
with IANA along with IETF standards track extensions.
66. Section 6.7 - inserted this section on registering out-of-band
attribute values with IANA as extensions.
67. Section 8.3 - clarified the use of URIs for each Client
Authentication mechanism.
68. Section 8.5 - added the security discussion around the new
operator/administrator operations.
69. Section 13.1.4.16 - added client-error-compression-not-
supported (0x040F)
70. Section 13.1.4.17 - added client-error-compression-error
(0x0410)
71. Section 13.1.4.18 - added client-error-document-format-error
(0x0411)
72. Section 13.1.4.19 - added client-error-document-access-error
(0x0412)
73. Section 13.1.5.10 - added server-error-multiple-document-
jobs-not-supported (0x0509)
74. Section 14 - added 'a-white', 'b-white', 'c-white', 'd-white',
and 'e-white' and clarified that the existing 'a', 'b', 'c',
'd', and 'e' values are size values. Added American,
Japanese, and European Engineering sizes, filled out
-transparent and - translucent media names and drawings for
the synchro cut sizes.
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75. Section 16 - softened the RECOMMENDATION for IPP Printer
attributes in a Directory schema so that they can have
equivalents.
76. Section 16 - added the OPTIONAL "pages-per-minute" and
"pages-per-minute-color" Printer attributes to the Directory
schema.
77. Section 16 - added OPTIONAL "multiple-document-jobs-supported"
to the Directory schema.
78. Section 16 - added RECOMMENDED "uri-authentication-supported",
"ipp-versions-supported", and "compression-supported" to the
Directory schema.
The following changes in semantics and/or conformance have been
incorporated into this document:
1. Section 3.1.6.3 - allowed a Printer to localize the
"detailed-status-message" operation response attribute, but
indicated that such localization might obscure the technical
meaning of such messages.
2. Section 3.1.8, 5.2.4, and 13.1.5.4 - Clients and IPP objects
MUST support version 1.1 conformance requirements. It is
recommended that they interoperate with 1.0. Also clarified
that IPP Printers MUST accept '1.1' requests. It is
recommended that they also accept '1.x' requests.
3. Section 3.2.1.1 and section 4.4.32 - changed the "compression"
operation and the "compression-supported" Printer Description
attribute from OPTIONAL to REQUIRED.
4. Sections 3.2.1.2 and 4.3.8 - changed "job-state-reasons" from
RECOMMENDED to REQUIRED, so that "job-state-reasons" MUST be
returned in create operation responses.
5. Sections 3.2.4, 3.3.1, 4.4.16, and 16 - changed Create-
Job/Send-Document so that they MAY be implemented while only
supporting one document jobs. Added the "multiple-document-
jobs-supported" boolean Printer Description attribute to
indicate whether Create-Job/Send-Document support multiple
document jobs or not. Added to the Directory schema.
6. Section 4.1.9 - deleted 'text/plain; charset=iso-10646-ucs-2',
since binary is not legal with the 'text' type.
7. Section 4.1.9.1 - added the RECOMMENDATION that a Printer
indicate by printing on the job's job-start-sheet that auto-
sensing has occurred and what document format was auto-sensed.
8. Section 4.2.4 - indicated that the "multiple-document-
handling" Job Template attribute MUST be supported with at
least one value if the Printer supports multiple documents per
job
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9. Section 4.3.7.2 - indicated that the 'job-restartable' job
state reason SHOULD be supported if the Restart-Job operation
is supported.
10. Section 4.3.8 - changed "job-state-reasons" from RECOMMENDED
to REQUIRED.
11. Section 4.3.8 - clarified the conformance of the values of the
"job-state-reasons" attribute by copying conformance
requirements from other sections of the document so that it is
clear from reading the definition of "job-state-reasons" which
values MUST or SHOULD be supported. The 'none',
'unsupported-compression', and 'unsupported-document-format'
values MUST be supported. The 'job-hold-until-specified'
SHOULD be specified if the "job-hold-until" Job Template is
supported. The following values SHOULD be supported: 'job-
canceled-by-user', 'aborted-by-system', and 'job-completed-
successfully'. The
'job-canceled-by-operator' SHOULD be supported if the
implementation permits canceling by other than the job owner.
The 'job-canceled-at-device' SHOULD be supported if the device
supports canceling jobs at the console. The 'job-completed-
with-warnings' SHOULD be supported, if the implementation
detects warnings. The 'job-completed-with-errors' SHOULD be
supported if the implementation detects errors. The 'job-
restartable' SHOULD be supported if the Restart-Job operation
is supported.
12. Section 4.3.10 - allowed a Printer to localize the "job-
detailed-status-message" Job Description attribute, but
indicated that such localization might obscure the technical
meaning of such messages.
13. Section 4.3.14 - changed the "time-at-creation", "time-at-
processing", and "time-at-completed" Event Time Job
Description attributes from OPTIONAL to REQUIRED.
14. Section 4.3.14.4 - added the REQUIRED "job-printer-up-time
(integer(1:MAX))" Job Description attribute as an alias for
"printer-up-time" to reduce number of operations to get job
times.
15. Section 4.4.2 - added the REQUIRED "uri-authentication-
supported (1setOf type2 keyword)" Printer Description
attribute to describe the Client Authentication used by each
Printer URI.
16. Section 4.4.12 - changed "printer-state-reasons" Printer
Description attribute from OPTIONAL to REQUIRED.
17. Section 4.4.12 - changed 'paused' value of "printer-state-
reasons" to MUST if Pause-Printer operation is supported.
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18. Section 4.4.14 - added the REQUIRED "ipp-versions-supported
(1setOf keyword)" Printer Description attribute, since IPP/1.1
Printers do not have to support version '1.0' conformance
requirements. Section 4.4.16 - added the "multiple-document-
jobs-supported (boolean)" Printer Description attribute so
that a client can tell whether a Printer that supports
Create-Job/Send-Document supports multiple document jobs or
not. This attribute is REQUIRED if the Create-Job operation
is supported.
19. Section 4.4.24 - changed the "queued-job-count" Printer
Description attribute from RECOMMENDED to REQUIRED.
20. Section 4.4.32 - changed "compression-supported (1setOf type3
keyword)" Printer Description attribute from OPTIONAL to
REQUIRED.
21. Section 5.1 - changed the client security requirements from
RECOMMENDED non-standards track SSL3 to MUST support Client
Authentication as defined in the IPP/1.1 Encoding and
Transport document [RFC2910]. A client SHOULD support
Operation Privacy and Server Authentication as defined in the
IPP/1.1 Encoding and Transport document [RFC2910].
22. Section 5.2.7 - changed the IPP object security requirements
from OPTIONAL non-standards track SSL3 to SHOULD contain
support for Client Authentication as defined in the IPP/1.1
Encoding and Transport document [RFC2910]. A Printer
implementation MAY allow an administrator to configure the
Printer so that all, some, or none of the users are
authenticated. An IPP Printer implementation SHOULD contain
support for Operation Privacy and Server Authentication as
defined in the IPP/1.1 Encoding and Transport document
[RFC2910]. A Printer implementation MAY allow an
administrator to configure the degree of support for Operation
Privacy and Server Authentication. Security MUST NOT be
compromised when the client supplies a lower version-number in
a request.
23. Section 14 (Appendix C): Corrected typo, changing the keyword
'iso-10-white' to 'iso-a10-white'.
See also the "IPP/1.1 Encoding and Transport" [RFC2910] document for
differences between IPP/1.0 [RFC2565] and IPP/1.1 [RFC2910].
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RFC 2911 IPP/1.1: Model and Semantics September 2000
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