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   Re: Question on ANY (its use in RDF)

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  • From: Marcus Carr <mrc@allette.com.au>
  • To: xml-dev@ic.ac.uk
  • Date: Mon, 25 Jan 1999 10:44:38 +1100

Roger L. Costello wrote:

> I have a question about the ANY type.  It is my understanding
> that an element defined to be of type ANY can contain any
> element that is defined *within* the DTD (i.e., it cannot use
> elements that are not defined in the DTD).  Correct?

My advice to anyone is never accept a DTD that uses ANY. The only legimate use I
have ever seen for it is in an interim DTD during data conversion. It's a sloppy
use of a sloppy mechanism - for example, would you really want to support an
infinite number of nested rdf:Description elements? There is no preventing this -
even the DOCTYPE element can be nested within itself.

> How can rdf:Description contain the element cat:tables?  It is
> not defined in rdf.dtd.  I thought that ANY says that the element
> can contain any elements defined *within* the DTD?

> Here is RDF.dtd:
> ...
> <!ENTITY % value "( %rdfObj; | PCDATA )">
> <!ELEMENT rdf:li ( %value; )>

Nor is the element PCDATA, used in the parameter entity named value. If this is
supposed to be #PCDATA, it needs to appear before %rdfObj;. Unless we're missing
something about extending this DTD, it appears to be a dud. Someone has not been
very considerate of your time.


Marcus Carr                      email:  mrc@allette.com.au
Allette Systems (Australia)      www:    http://www.allette.com.au
"Everything should be made as simple as possible, but not simpler."
       - Einstein

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