From: Dan Connolly (connolly@w3.org)
Date: 10/11/01
There's a question of whether, given that W3C is doing an XML Query language, would we ever need another query language for RDF or DAML or whatever... The discussion goes back at least as far as... QL'98 - The Query Languages Workshop http://www.w3.org/TandS/QL/QL98/ The XML Query WG was an outcome of that workshop; meanwhile, though there's no W3C working group on RDF query, folks have been busy. In a meeting with the XML Query chair, I asked whether XML Query was designed to do the sorts of stuff folks do with RDF query systems: subclass inference, that sort of thing. He responded, quite rightly: "send me some use cases and we'll see." So I recruited some folks to send RDF query use cases: RDF query use-cases From: Libby Miller (Libby.Miller@bristol.ac.uk) Date: Tue, Jun 12 2001 http://lists.w3.org/Archives/Public/www-xml-query-comments/2001Jun/0007.html Anybody else with a query system that might or might not overlap in functionality with W3C's XML Query is encouraged to likewise ask the XML Query WG whether their design meets your requirements by sending use cases. Unfortunately, I'm having a hard time getting a formal response from the XML Query WG on this stuff. Meanwhile, Jonathan Robie has taken the ball and run with it to some extent: he shows that RDF can be transformed, using XML Query algebra operators, into a sort of normal form, and then queried from there. At least, that's the way I understand it. I wasn't there, and I can't find technical details with google, except for stuff like... [[[ At Extreme Markup 2001, Jonathan Robie gave a -terrific- demonstration of using XML Query to query RDF, to the point where this may now become my preferred RDF query language! ]]] -- www-rdf-logic@w3.org from August 2001: Re: Summary of the QName http://lists.w3.org/Archives/Public/www-rdf-logic/2001Aug/0048.html Fri, 17 Aug 2001 02:27:56 GMT -- Dan Connolly, W3C http://www.w3.org/People/Connolly/
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