XML::Parser::ContentModel Methods (Perl in a Nutshell, 2nd Edition)

13.6. XML::Parser::ContentModel Methods

When referred to as a string, these objects are automatically converted to a string representation of the model (or content particle):

isempty: Returns true if the object is EMPTY, false otherwise.
isany: Returns true if the object is ANY, false otherwise.
ismixed: Returns true if the object is (#PCDATA) or (#PCDATA|...)*, false otherwise.
isname: Returns true if the object is an element name.
ischoice: Returns true if the object is a choice of content particles.
isseq: Returns true if the object is a sequence of content particles.
quant: Returns undef or a string representing the quantifier (?, *, +) associated with the model or particle.
children: Returns undef or (for mixed, choice, and sequence types) an array of component content particles. There will always be at least one component for choices and sequences, but for a mixed content model of pure PCDATA, (#PCDATA), then undef is returned.