- From: Benjamin Grosof <bgrosof@MIT.EDU>
- Date: Thu, 22 May 2003 08:21:19 -0400
- To: www-rdf-rules@w3.org, eric@w3.org, connolly@w3.org
% notes from WWW-2003 BOF discussion on relating RDF-Query to XQuery % by Benjamin Grosof 5/22/03 Here are the notes I took. Not "official", please post corrections/additions to the www-rdf-rules list. Benj, EricP, Andy Seaborne, DanC, general consensus: worth looking at how to do RDF-Q stuff in XQuery: EricP: XQuery has lots of nice stuff Benj and various: can reduce lots of RDF-Q stuff to XQuery, front end XQuery engines with more RDF-specific query lang and then do some query/result reformulation (incl. later for optimization); even keep track of; graph vs. tree will matter sometimes; can infer in rule-ish manner using ability to return / be constructive in head of query Nick Gibbons: RDF has aspects of model-theoretic semantics we need to support Brian McBride: probably OK usually to ignore whether stuff is ground or not DanC: want to do some inference about what's true Me: e.g., use rules for RDFS stuff (e.g., subclassof) TimBL: there's a FLOWER pattern (Forall Let Where) in XQuery queries which is often unnecessarily complex for RDF querying, and probably hurts ability to optimize getting at triple stores Andy Seaborne: want to replace the XPath part of XQuery by something more RDF-specific; good to leverage on XQuery aspects that support things like XML-Schemas DanC: want to have test cases that show what XQuery can't do that we need for RDF-Q EricP and TimBL: let's have and RDF-Path for simpler stuff, then another RDF thing TimBL: let's also look at having a canonical XML syntax for RDF, lots of people want that Benj: in TimBL's keynote story about lots of XML data being put into RDF to be shared, the expressiveness needed will probably not be more, or much more, than XQuery supports, so we could get a lot of leverage from the above; then for stuff that starts out in life as RDF, we do things using other more RDF-powerful query lang/engines TimBL: interesting to keep track of what started out as RDF vs. as XML ff-up meeting: Fri eve - see by Fri noon: look on message point, EricP also see WIKI (shared webspace): http://esw.w3.org/topic/ ________________________________________________________________________________________________ Prof. Benjamin Grosof Web Technologies for E-Commerce, Business Policies, E-Contracting, Rules, XML, Agents, Semantic Web Services MIT Sloan School of Management, Information Technology group http://ebusiness.mit.edu/bgrosof or http://www.mit.edu/~bgrosof
Received on Thursday, 22 May 2003 08:20:30 UTC