Can XQuery do RDF Query? DAML Query?

From: Dan Connolly (
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

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 (
  Date: Tue, Jun 12 2001

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
using XML Query to query RDF, to the point where this may now become my
preferred RDF query language!

-- from August 2001: Re: Summary of the
Fri, 17 Aug 2001 02:27:56 GMT

Dan Connolly, W3C

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