CDATA Section

John Cowan cowan at locke.ccil.org
Wed Oct 20 20:38:52 BST 1999


Gordon, Simon scripsit:

> > <?xml version='1.0'?>
> > <!DOCTYPE TEST [
> > <!ELEMENT TEST (CDATA)>

The problem is with this line, which says that TEST elements must contain
a single *element* whose name is "CDATA".  This has nothing to do with
CDATA sections.

> > Warning: CDATA section not allowed here
> >  in unnamed entity at line 5 char 16 of file:test.xml

Quite right; your document is invalid because your TEST element
contains character data instead of an element named CDATA.

> > PS. Just tried <!ELEMENT TEST {#PCDATA)> and removing the DOCTYPE section
> > altogether. The former passes the validation test and the latter passes
> > the well-formedness test (rxp -xs test.xml)!

And rightly so.  You cannot *compel* the content of an element to be
a CDATA section or not by using DTD-based validation.  Elements declared
with #PCDATA content may express that content with or without
CDATA sections.

-- 
John Cowan                                   cowan at ccil.org
       I am a member of a civilization. --David Brin

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