- From: Pierre-Antoine CHAMPIN <champin@bat710.univ-lyon1.fr>
- Date: Fri, 24 Nov 2000 16:17:02 +0100
- To: Jonas Liljegren <jonas@rit.se>
- CC: Graham Klyne <GK@Dial.pipex.com>, ML RDF-interest <www-rdf-interest@w3c.org>
Jonas Liljegren wrote: > The variables is necessary if you want something two or more steps > away. Not only ! As Graham pointed out : Graham Klyne wrote: > What is the purpose of variables in such a query? > > (a) maybe to establish the existence of a given property for a subject, > without caring about its object value? > [?S] --rdf:type-------> [rdf:Statement] > [?S] --rdf:subject----> [SomeResource] > [?S] --rdf:predicate--> [??] > [?S] --rdf:object-----> [??] The two last lines guarantee that only "full" quads will be retrieved. I would not stand up a fight for partial statements, though :) Actually, Graham summed up very well my position is a previous post : the pain in disallowing them looks greater than the pain in allowing them, and we should not disallow them only because WE don't see them as useful... Pierre-Antoine
Received on Friday, 24 November 2000 10:20:29 UTC