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RE: Supplemental XQuery reading list

From: Seaborne, Andy <andy.seaborne@hp.com>
Date: Fri, 16 Apr 2004 16:16:21 +0100
Message-ID: <E864E95CB35C1C46B72FEA0626A2E808028A2B4A@0-mail-br1.hpl.hp.com>
To: RDF Data Access Working Group <public-rdf-dawg@w3.org>

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 --
> > -eric
> > 
> > office: +81.466.49.1170 W3C, Keio Research Institute at SFC,
> >                         Shonan Fujisawa Campus, Keio University,
> >                         5322 Endo, Fujisawa, Kanagawa 252-8520       
> >         JAPAN +1.617.258.5741 NE43-344, MIT, Cambridge, MA 02144 USA
> > cell:   +1.857.222.5741 (does not work in Asia)
> > 
> > (eric@w3.org)
> > Feel free to forward this message to any list for any purpose other
> > than email address distribution. 
Received on Friday, 16 April 2004 11:16:47 GMT

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