- From: Steve Harris <S.W.Harris@ecs.soton.ac.uk>
- Date: Tue, 14 Dec 2004 10:40:35 +0000
- To: RDF Data Access Working Group <public-rdf-dawg@w3.org>
On Tue, Dec 14, 2004 at 10:06:28AM +0000, Dave Beckett wrote:
> > Simon suggested we look at expressing that in the WHERE clause:
> >
> > SELECT ?title ?price
> > WHERE (?book dc:title ?title)
> > (?book ns:price ?price)
> > (?price op:lessThan 42)
> >
> > which would presumable match the above data. But would it match
>
> It won't work with any existing RDQL-like system I have seen
> as it is assumes an entirely different operation from matching
> triples and closer to rules. I oppose this expansion.
+1
it quickly becomes unwieldy if you have some complex expressions,
or functions like
WHERE (?place1 :lat ?lat1)
(?place1 :long ?long1)
(?place2 :lat ?lat2)
(?place2 :long ?long2)
AND :withinKilometers(50.0, ?lat1, ?long1, ?lat2, ?long2)
- Steve
Received on Tuesday, 14 December 2004 10:40:38 UTC