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   Re: [xml-dev] Newbie question:DTD problem(#PCDATA)

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Allen Chu wrote:

> What I present in element bio is more than one #PCDATA or
> footnote. Changing to from "+" to "*" makes bio contain zero or more
> #PCDATA/footnote. In this case, neither #PCDAT nor footnote is required
> for bio. And that violates my original design. Therefore, I don't think
> "*" will make them equvalent from my understanding.

Your SGML DTD also allows no content, as #PCDATA is defined as zero or 
more characters. For that reason, SGML DTD developers more often use "*" 
instead of "+" for a mixed content content model, even though they are 
functionally equivalent. It's thought to be more descriptive - a 
reminder that <bio></bio> is a legal occurrence of a bio element.


Marcus Carr                      email:  mcarr@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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