Re: Missing results on DBPedia end point

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