1.5. Packages in the SAX2 API
SAX2 consists of three packages:
This package contains the core SAX
interfaces and exceptions, plus two concrete classes.
The package has SAX1 as well as SAX2 support.
As suggested by its name, this
package exists to help applications use the SAX core.
Most of its classes are utility implementations of core
interfaces (except the parser interfaces), but the
portable bootstrap APIs are also part of this package.
SAX2 added to what SAX1 started.
This package holds the SAX2
extension handlers, described earlier, and will probably
grow to hold other SAX2 extensions in the future.
Only the org.xml.sax
package is guaranteed to be part of every SAX distribution.
The helpers don't depend on the extensions, to
preserve this notion of "core plus options."
In practice, it's a rare distribution that doesn't include all
of these packages, and SAX2 parsers without support for the
extension handlers are likely to support only XML subsets.
JAXP 1.1 (and hence JDK 1.4) includes all three packages.
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