Hi Lorenz, This looks like a known issue a fix is currently being finalised for, see:
https://github.com/openlink/virtuoso-opensource/issues/111
<https://github.com/openlink/virtuoso-opensource/issues/111>
http://sourceforge.net/p/dbpedia/mailman/message/32478789/
<http://sourceforge.net/p/dbpedia/mailman/message/32478789/>
So we should fix for this available in the open source archive soon …
Best Regards
Hugh Williams
Professional Services
OpenLink Software, Inc. // http://www.openlinksw.com/
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Universal Data Access, Integration, and Management Technology Providers
> On 10 Nov 2014, at 09:06, Lorenz Bühmann <buehm...@informatik.uni-leipzig.de>
> wrote:
>
> Hi,
>
> I loaded parts of the DBpedia dataset into my local Virtuoso instance. The
> version is Virtuoso version 07.10.3211 on Linux (x86_64-unknown-linux-gnu),
> Single Server Edition .
>
> The endpoint is available at
> http://akswnc3.informatik.uni-leipzig.de:8860/sparql
> <http://akswnc3.informatik.uni-leipzig.de:8860/sparql>
>
> When I run the query (see http://tinyurl.com/qhdzlbg
> <http://tinyurl.com/qhdzlbg> )
>
> describe(<http://dbpedia.org/resource/Bumblehood>
> <http://dbpedia.org/resource/Bumblehood>)
>
> to get triples about a specific resource, I get
>
> @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
> <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
> @prefix dbpedia: <http://dbpedia.org/resource/>
> <http://dbpedia.org/resource/> .
> @prefix ns2: <http://schema.org/> <http://schema.org/> .
> dbpedia:Bumblehood rdf:type ns2:Organization .
> @prefix ns3: <http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#>
> <http://www.ontologydesignpatterns.org/ont/dul/DUL.owl#> .
> dbpedia:Bumblehood rdf:type ns3:SocialPerson .
> @prefix ns4: <http://dbpedia.org/ontology/> <http://dbpedia.org/ontology/> .
> dbpedia:Bumblehood rdf:type ns4:Company .
> @prefix owl: <http://www.w3.org/2002/07/owl#>
> <http://www.w3.org/2002/07/owl#> .
> dbpedia:Bumblehood rdf:type owl:Thing ,
> ns3:Agent ,
> ns4:Organisation ,
> ns4:Agent .
> @prefix xsd: <http://www.w3.org/2001/XMLSchema#>
> <http://www.w3.org/2001/XMLSchema#> .
> dbpedia:Bumblehood ns4:formationDate "2009-02-15+02:00"^^xsd:date ;
> ns4:keyPerson dbpedia:Chief_executive_officer ;
> ns4:location dbpedia:Zagreb ,
> dbpedia:Moscow ,
> dbpedia:Munich ;
> ns4:numberOfEmployees 17 ;
> ns4:type dbpedia:Privately_held_company .
> @prefix foaf: <http://xmlns.com/foaf/0.1/> <http://xmlns.com/foaf/0.1/> .
> dbpedia:Bumblehood foaf:homepage <http://www.bumblehood.com/>
> <http://www.bumblehood.com/> ;
> foaf:name "Bumblehood, Inc."@en .
>
> Now suppose I want to go into the inverse direction, that means I run a query
> (see http://tinyurl.com/of472dp <http://tinyurl.com/of472dp> ) to get all
> resources that have the same formation date, i.e.
>
> SELECT DISTINCT ?s WHERE {
> ?s <http://dbpedia.org/ontology/formationDate>
> <http://dbpedia.org/ontology/formationDate>
> "2009-02-15+02:00"^^<http://www.w3.org/2001/XMLSchema#date>
> <http://www.w3.org/2001/XMLSchema#date>.
> }
>
> it returns an empty set. I know that there are some problems with dates, but
> I don't get the point here, because date literals are returned but can not be
> used to match the same resource.
>
> I read about some workarounds like filtering by the lexical form, e.g.
>
> SELECT DISTINCT ?s WHERE {
> ?s <http://dbpedia.org/ontology/formationDate>
> <http://dbpedia.org/ontology/formationDate> ?date.
> FILTER(STR(?date) = "2009-02-15+02:00")
> }
>
> but that also does not work (see http://tinyurl.com/pmuu5fr
> <http://tinyurl.com/pmuu5fr> ). It only works if I use a different lexical
> form and omit the timezone information from the string, like
>
> SELECT DISTINCT ?s WHERE {
> ?s <http://dbpedia.org/ontology/formationDate>
> <http://dbpedia.org/ontology/formationDate> ?date.
> FILTER(STR(?date) = "2009-02-15")
> }
>
> which is also some kind of strange as I would assume the lexical form is just
> "2009-02-15+02:00" .
>
> Is there anything I'm doing wrong?
>
>
> Kind regards,
> Lorenz
>
> --
> Lorenz Bühmann
> AKSW group, University of Leipzig
> Group: http://aksw.org <http://aksw.org/> - semantic web research center
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