- From: Richard Cyganiak <richard@cyganiak.de>
- Date: Sun, 26 Sep 2010 17:00:48 +0100
- To: Christophe Guéret <cgueret@few.vu.nl>
- Cc: Linked Data community <public-lod@w3.org>
Sounds like it might be an instance of this problem: http://www.semanticoverflow.com/questions/947/dbpedia-sparql-endpoint-xsddate-comparison-weirdness If not, then perhaps asking this on the DBpedia mailing list might get better responses. https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion Best, Richard On 26 Sep 2010, at 16:03, Christophe Guéret wrote: > Hello, > > There seems to be an issue with the SPARQL end point of DBPedia, http://dbpedia.org/sparql > . > > When I run this first query: > > SELECT ?result WHERE {<http://dbpedia.org/resource/WVNS-DT2 > <http://dbpedia.org/resource/WVNS-DT2>> > <http://dbpedia.org/ontology/formationDate > <http://dbpedia.org/ontology/formationDate>> ?result. } > > I get the following result telling me that ?result is a date: > > <sparql xmlns="http://www.w3.org/2005/sparql-results#" > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" > xsi:schemaLocation="http://www.w3.org/2001/sw/DataAccess/rf1/result2.xsd > "> > <head> > <variable name="result"/> > </head> > <results distinct="false" ordered="true"> > <result> > <binding name="result"><literal > datatype="http://www.w3.org/2001/XMLSchema#date">2006-09-13</ > literal></binding> > </result> > </results> > </sparql> > > > But when I want to find a resource which matches that specific date, > no result are returned: > > SELECT ?result WHERE { ?result > <http://dbpedia.org/ontology/formationDate> "2006-09-13"^^<http://www.w3.org/2001/XMLSchema#date > >. } > > gives > > <sparql xmlns="http://www.w3.org/2005/sparql-results#" > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" > xsi:schemaLocation="http://www.w3.org/2001/sw/DataAccess/rf1/result2.xsd > "> > <head> > <variable name="result"/> > </head> > <results distinct="false" ordered="true"> > </results> > </sparql> > > > Could this be a bug of some sort? I also tried to run the same > couple of queries on http://lod.openlinksw.com/sparql and everything > works fine there. > > > Cheers, > Christophe > > > -- > Dr. Christophe Guéret (cgueret@few.vu.nl) > http://cgueret.net > Postdoc working on SOKS (http://www.few.vu.nl/soks) > Knowledge Representation& Reasoning Group > Computational Intelligence Group > Department of Computer Science, AI > VU University Amsterdam > > <cgueret.vcf>
Received on Sunday, 26 September 2010 16:01:24 UTC