- From: Dan Connolly <connolly@w3.org>
- Date: Thu, 12 May 2005 09:21:45 -0500
- To: Stephane Fellah <stephanef@imagemattersllc.com>, public-rdf-dawg-comments@w3.org
Sorry for the delay in responding to your comment of 20 Apr 2005 http://lists.w3.org/Archives/Public/public-rdf-dawg-comments/2005Apr/0038.html > I am currently trying to create user-defined spatial operators for SPARQL. Interesting! [...] > It seems to me that the current specification does not provide a way to pass the description of p1 in the query [...] > To support this query, SPARQL needs a mechanism to pass the user defined > triples, so they could be added as premises in the query engine (DQL is > using such concept) prior to the evaluation on any graph. Note that the FROM keyword is back in the recent draft... http://www.w3.org/TR/2005/WD-rdf-sparql-query-20050419/#specifyingDataset which allows specifying premises by reference. > The handling of > the premises would be pretty straightforward to implement by any SPARQL > query engine. One implementation strategy that is consistent with the specification is for the engine to index its dataset before receiving queries and not handle on-the-fly additional premises. > ISSUE 2: OPTIONAL OR NULL PARAMETERS. > ISSUE 3: DESCRIPTION OF SUPPORTED FUNCTIONS IN SPARQL PROTOCOL. More on those separately... -- Dan Connolly, W3C http://www.w3.org/People/Connolly/ D3C2 887B 0F92 6005 C541 0875 0F91 96DE 6E52 C29E see you at XTech in Amsterdam 24-27 May?
Received on Thursday, 12 May 2005 14:21:51 UTC