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Re: [xml-dev] PCDATA and CDATA
- From: Mike Brown <email@example.com>
- To: firstname.lastname@example.org
- Date: Sat, 15 Sep 2001 18:31:26 -0600 (MDT)
Michael Fitzgerald wrote:
> #PCDATA [...] specifies that an element will contain parsed
> character data. Parsing tests whether the characters conform to the
> lexical constraints imposed by XML 1.0.
> CDATA appears in attribute declarations and specifies that an
> attribute will contain character data that is not parsed.
That's not accurate. All characters in an XML document are "parsed" in
the sense that you describe.
"CDATA" is a token used in an attribute declaration to declare the
attribute as having a string type. '&', and '<' and the quote character
used for delimiting the attribute value have special meaning in
attributes of this type.
"#PCDATA" is a token used in an element declaration to declare the
element as having mixed content (character data, or character data mixed
with other elements). The content of the element is parsed; '&' and '<'
have special meaning and must be escaped if they aren't the start of
A "CDATA section", bounded in markup by "<![CDATA[" and "]]>" is, by
comparison, "unparsed" character data (though even it is subject to at
least one restriction -- it can't contain "]]>"). A CDATA section can
only appear in element content, and it has nothing to do with the
"CDATA" token used in attribute decls.
mike j. brown, fourthought.com | xml/xslt: http://skew.org/xml/
denver/boulder, colorado, usa | personal: http://hyperreal.org/~mike/