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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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