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RE: Fixing SPARQL Query in GRDDL Primer

From: Ian Davis <Ian.Davis@talis.com>
Date: Wed, 7 Feb 2007 08:32:05 -0000
Message-ID: <DD5E887552496241BC701548837A282F053323E7@nemo.talis.local>
To: "Harry Halpin" <hhalpin@ibiblio.org>, "public-grddl-wg" <public-grddl-wg@w3.org>

The following appears to work for me:

PREFIX ical: <http://www.w3.org/2002/12/cal/icaltzd#>
PREFIX xs: <http://www.w3.org/2001/XMLSchema#>
SELECT ?start1 ?stop1 ?loc1 ?summ1 ?summ2 ?summ3

FROM <http://www.w3.org/2001/sw/grddl-wg/doc29/david-erdf.rdf>
FROM <http://www.w3.org/2001/sw/grddl-wg/doc29/robin-hcal-grddl.rdf>
FROM <http://www.w3.org/2001/sw/grddl-wg/doc29/janeschedule.rdf>

	?event1 a ical:Vevent;
              ical:summary ?summ1 ;
  	      ical:dtstart ?start1 ;
              ical:dtend ?stop1 ;
              ical:location ?loc1.
  	?event2 a ical:Vevent;
              ical:summary ?summ2 ;
  	      ical:dtstart ?start2;
              ical:dtend ?stop2;
              ical:location ?loc2.
  	?event3 a ical:Vevent;
              ical:summary ?summ3 ;
  	      ical:dtstart ?start3;
              ical:dtend ?stop3;
              ical:location ?loc3.

	FILTER (  ?event1 != ?event2) .
	FILTER (  ?event2 != ?event3) .
	FILTER (  ?event1 != ?event3) .
      FILTER ( xs:string(?start1) = xs:string(?start2) ).
      FILTER ( xs:string(?stop1) = xs:string(?stop2) ).
      FILTER ( xs:string(?start1) = xs:string(?start3) ).
      FILTER ( xs:string(?stop1) = xs:string(?stop3) ).
      FILTER ( xs:string(?loc1) = xs:string(?loc2) ).
      FILTER ( xs:string(?loc1) = xs:string(?loc3) ).


I interpret that as: "find three distinct events such that they each
have the same start, stop and location". I couldn't get this working
with xs:date - but I think it should so perhaps it's a problem with the
underlying sparql engine.

See it here (courtesy of xmlarmyknife.com):




> -----Original Message-----
> From: public-grddl-wg-request@w3.org 
> [mailto:public-grddl-wg-request@w3.org] On Behalf Of Harry Halpin
> Sent: 07 February 2007 04:09
> To: public-grddl-wg
> Subject: Fixing SPARQL Query in GRDDL Primer
> Everyone,
>     I tried to fix the SPARQL query in the GRDDL Primer so it 
> works with Embedded RDF minus the data-types, but I still 
> can't get it to run. Any ideas? Someone here must know SPARQL 
> enough to figure this one out...
> The query in question is this one:
> http://www.w3.org/2001/sw/grddl-wg/doc29/schedulequery.rq
> Which matches all the data except david's Embedded RDF generated RDF.
> Using xsd:dateTime to explicitly cast produces this query:
> http://www.ibiblio.org/hhalpin/homepage/notes/schedulequery.rq
> Which unfortunately seems to not produce any results. Both me 
> and dajobe are not sure why. This makes me thing the problem 
> is either David's eRDF GRDDL generated RDF:
> http://www.w3.org/2001/sw/grddl-wg/doc29/david-erdf.rdf
> Or the query itself :(
> Any ideas?
> -- 
> 		-harry
> Harry Halpin,  University of Edinburgh
> http://www.ibiblio.org/hhalpin 6B522426
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Received on Wednesday, 7 February 2007 08:33:35 UTC

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