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   RE: RE: RE: [xml-dev] XQuery and DTD/Schema?

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On Sat, 6 Jul 2002, Dare Obasanjo wrote:

> -----Original Message----- 
> From: John Cowan [mailto:jcowan@reutershealth.com] 
> Sent: Sat 7/6/2002 11:11 AM 
> To: Jonathan Robie 
> Cc: Mike Champion; xml-dev@lists.xml.org 
> Subject: Re: RE: RE: [xml-dev] XQuery and DTD/Schema?
> >> features of RELAX-NG, such as co-occurrence constraints, that are not
> >> supported in our data model.
> >Can you please explain what you meant by "co-occurrence constraints"
> >in this context?
>  Probably the most requested feature for W3C XML Schema from our users
> is the ability to specify occurence constraints for various attributes
> and elements based on the value or occurence of other elements and
> attributes. My oft quoted example is "How do I specify either there is a
> server-available attribute set to false or the server-available
> attribute is set to true AND there is a server-uptime element as a child
> of the attribute's parent element"

This sounds like a job for the Schematron.

I have been telling my XML classes that "XML provides 90% of the
power of SGML with only 10% of the complexity."  I hope I don't have to
eat my words.

J. David Eisenberg  http://catcode.com/


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