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Re: Supplemental XQuery reading list

From: Eric Prud'hommeaux <eric@w3.org>
Date: Fri, 16 Apr 2004 13:58:10 -0400
To: Howard Katz <howardk@fatdog.com>
Cc: "Seaborne, Andy" <andy.seaborne@hp.com>, RDF Data Access Working Group <public-rdf-dawg@w3.org>
Message-ID: <20040416175810.GA26528@w3.org>

On Fri, Apr 16, 2004 at 10:08:15AM -0700, Howard Katz wrote:
> 
> Jonathan's is the XQuery with Functional Accessor stuff? I saw the
> presentation but couldn't find anything else online.

That mostly came from Jerome Simeone, but at a BOF at XML2003,
Jonathan said that XQueryFA was in the spirit of his conclusions
in his paper The Syntactic Web [4].

> On a different but related topic, since we don't have time allocated for it
> on the agenda, would anyone be interested in a BOF for a freeform discussion
> on XQuery/RDF on the Thursday evening say (after a nice day of getting to
> know one and other and a pleasant dinner)? Personally, I generally get more
> questions answered in one hour of face-to-face than in two or three weeks of
> email and/or blindly stumbling around the web.

Though it will be before the lightening talks, I can imagine it being
fruitful. I'm game.

> > -----Original Message-----
> > From: public-rdf-dawg-request@w3.org
> > [mailto:public-rdf-dawg-request@w3.org]On Behalf Of Seaborne, Andy
> > Sent: Friday, April 16, 2004 8:16 AM
> > To: RDF Data Access Working Group
> > Subject: RE: Supplemental XQuery reading list
> >
> >
> >
> > See also Jonathan Robie's talk at the tech plenary:
> >
> > http://www.w3.org/2004/Talks/tp-robie/
> >
> > He and I talked about this beforehand - the use of XQuery to extract
> > information from RDF sources and create XHTML/XML looks like a good use of
> > XQuery.  The approach is to provide accessors into the RDF graph (the
> > abstract syntax, not the concrete RDF/XML syntax).
> >
> > 	Andy
> >
> > -------- Original Message --------
> > > From: Howard Katz <>
> > > Date: 16 April 2004 15:53
> > >
> > > > I can't speak to Andy's agenda, but one point that's been kicking
> > > > around in the XQuery/RDF Query arena for a while is that XQuery can be
> > > > used to express SQL queries so it must be able to express RDF
> > > > queries.
> > >
> > > It can, if you're able to work out a mapping from the RDF data model
> > > into
> > > the XQuery data model, which is basically the XML Infoset + XML Schema
> > > support + support for multiple documents.
> > >
> > > I'm finding myself quite interested in the inverse problem: would it be
> > > possible and useful to be able to map from the XQuery surface language
> > > into
> > > an underlying RDF graph-based data model, so that XQuery syntax can be
> > > used
> > > to interrogate an RDF data store more or less directly? In other words,
> > > can
> > > we swap out XQuery's underlying XML-based data model and slide in an
> > > RDF-based one in its place so that we don't have to do the mapping to
> > > XML?
> > > I'll be talking about this after Amsterdam.
> > >
> > > > I've seen a couple approaches that I believe workable [1]
> > > > [2], but would like to see how people solve the problem for SQL.
> > >
> > > I've given a few pointers in my response to Andy's email re SQL-to-XML
> > > mappings for XQuery.
> > >
> > > > I suspect that in standardizing an RDF query language we are going
> > > > beyond where existing SQL mappings to XQuery have gone in that we want
> > > > *one* mapping to XQuery that operates on XQuery+whatever
> > > > implementations from different vendors. Does such a "standard" mapping
> > > > to SQL exist?
> > >
> > > I'm not sure what you mean by the last, Eric. Can you explain a bit
> > > more?
> > >
> > > Howard
> > >
> > > > [1] http://www.w3.org/2001/11/13-RDF-Query-Rules/#XQueryFA
> > > > [2] http://www.w3.org/2001/11/13-RDF-Query-Rules/#TreeHugger
> > [3] http://www.w3.org/2004/Talks/tp-robie/
[4] http://www.idealliance.org/papers/xml2001/papers/html/03-01-04.html
-- 
-eric

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Received on Friday, 16 April 2004 13:58:12 GMT

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