Re: Missing results on DBPedia end point

Hi Christophe,

> 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/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.

We will investigate this and report back to the list.


Patrick

Received on Monday, 27 September 2010 10:00:20 UTC