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   Re: CDATA by any other name... (was The raw and the cooked)

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  • From: <david@megginson.com>
  • To: "XML Developers' List" <xml-dev@ic.ac.uk>
  • Date: Fri, 30 Oct 1998 11:23:00 -0500 (EST)

Henry S. Thompson writes:

 > <david@megginson.com> writes:
 > > So, Henry's asking whether this is valid:
 > > 
 > >   <!DOCTYPE a [
 > >     <!ELEMENT a (b, c)>
 > >     <!ELEMENT b EMPTY>
 > >     <!ELEMENT c EMPTY>
 > >   ]>
 > >   <a><![CDATA[  ]><b/><c/></a>

And I'll answer my original posting and say that it's not valid
because it's not well-formed -- let's try

  <!DOCTYPE a [
    <!ELEMENT a (b, c)>
  <a><![CDATA[  ]]><b/><c/></a>

instead, and continue the discussion from there.

 > What he said.  The DOM made a serious mistake here in my opinion:
 > it's stranded in no-person's-land between raw and cooked, without
 > being either.  It's not cooked, because it gives you
 > EntityReference and CDATA nodes.  It's not raw, because it DOESN'T
 > give you character entity references.

The DOM level-one core serves two constituencies -- authoring tools
that need to do horizontal transformations (XML=>XML, where the result
replaces the original) and processing/rendering tools that need to do
downstream processing (XML=>XML or XML=>X, where the original remains
unaltered).  Horizontal transformations will usually be somewhat
lossy, and the DOM WG has clearly decided that only a few lexical
features were important enough to give a good cost/benefit return on
the effort required to specify and implement them.

However, the point is that a specific DOM tree doesn't *have* to
include nodes for comments, CDATA sections, and entity references --
they are there only to support very specialised applications and
should be stripped out for ordinary XML processing.

All the best,


David Megginson                 david@megginson.com

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