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Re: XML, namespaces, extensibility and validation

From: Dan Connolly <connolly@w3.org>
Date: Wed, 05 Sep 2007 17:20:55 -0500
To: olivier Thereaux <ot@w3.org>
Cc: www-tag@w3.org
Message-Id: <1189030855.29837.2185.camel@pav>

On Mon, 2007-06-25 at 15:22 +0900, olivier Thereaux wrote:
> Hi Tim, Hi TAG list,
> (note I'm not subscribed, would appreciate being kept in Cc)
[...]
> > - Therefore, groups like ARIA ought to be able to extend XHTML by  
> > introducing new elements and attributes.
> 
> I think we have seen some progress in this area. See how the XHTML 
> +RDFa was created, and can be validated (with the beta-soon-released  
> validator only, for now). Note that they had to go and create a  
> profile and DTD, that is, an XHTML+RDFa document cannot claim to be  
> an XHTML document, with some stuff in a foreign namespace slapped  
> into it. That, I believe, is contrary to the basic conformance  
> statement for XHTML: http://www.w3.org/TR/xhtml1/#strict

This involves making a new driver DTD, right?

Contrast that with the my:box usecase, which I suggest
is more web-like:
http://lists.w3.org/Archives/Public/public-xml-versioning/2007Feb/0000

It seems to me that XML Schema substitution group were designed
for exactly this sort of extensibility, but XHTML, SMIL, SVG,
nor CDF is using it, and I can't figure out why not.

-- 
Dan Connolly, W3C http://www.w3.org/People/Connolly/
Received on Wednesday, 5 September 2007 22:21:11 GMT

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