- From: Seaborne, Andy <andy.seaborne@hp.com>
- Date: Fri, 16 Apr 2004 16:16:21 +0100
- 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 UTC