Missing results on DBPedia end point

Christophe Guéret Sun, 26 Sep 2010 08:06:05 -0700

 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, noresult 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 ofqueries on http://lod.openlinksw.com/sparql and everything works fine there.



Cheers,
Christophe


--
Dr. Christophe Guéret (cgue...@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

<<attachment: cgueret.vcf>>

Missing results on DBPedia end point

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