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   Re: John replies to Ron: Differences

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  • From: rbourret@dvs1.informatik.tu-darmstadt.de (Ron Bourret)
  • To: xml-dev@ic.ac.uk
  • Date: Thu, 4 Jun 1998 18:10:56 +0200

John Cowan writes:

> Ron Bourret writes:
> > To indicate a PCDATA-only element, I use a PCData element while John
> > uses an empty MIXED element. Although the PCData element is not
> > strictly necessary, I think the commonality of PCDATA-only content
> > makes it useful. 
> I was thinking that PCDATA-only content is not so common.  Most of
> the time, textual elements contain fancy-text information like bold,
> italic, or whatever.  Pure plain text with no markup allowed probably
> makes the most sense in title elements and such.

Content models of PCDATA and EMPTY represent the terminals in DTDs.  That is, 
bold, italic, etc. have a PCDATA content model.  Furthermore, in more data (as 
opposed to document) applications of XML, PCDATA-only content seems to be 
relatively common.  For the moment, I have left PCData in and required Mixed to 
take at least one ElementRef, per your earlier suggestion.

-- Ron Bourret

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