Hi Heiko,
I think your query is correct and it is very likely that the "problem" lies
in the Wikipedia category system.
All I know about it (after a very shallow analysis which led me to
currently discard it for my purposes) is that it is not a tree (multiple
parents + cycles).
Please bear that in mind when working with it :-)
Cheers
Andrea
2013/10/19 Heiko Paulheim <he...@informatik.uni-mannheim.de>
> Dear DBpedians,
>
> I am trying to read all categories for a subject, including the
> transitive closure w.r.t. skos:broader.
>
> My query to attempt this is
> SELECT ?subject WHERE {dbpedia:Tim_Berners-Lee dcterms:subject ?s . ?s
> skos:broader ?subject OPTION(TRANSITIVE, T_DISTINCT,
> T_IN(?s),T_OUT(?subject),T_MIN(0))}
>
> While the first results look sensible, scrolling down the lists yields
> categories such as
> http://dbpedia.org/resource/Category:Religion_in_Egypt
> http://dbpedia.org/resource/Category:Ethnic_groups_in_Slovenia
> http://dbpedia.org/resource/Category:Subjects_taught_in_medical_school
> http://dbpedia.org/resource/Category:Water_in_France
> http://dbpedia.org/resource/Category:Low-energy_building
>
> ...just to name a few, see
>
> http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&query=SELECT+%3Fsubject+WHERE+{dbpedia%3ATim_Berners-Lee+dcterms%3Asubject+%3Fs+.+%3Fs+skos%3Abroader+%3Fsubject+OPTION%28TRANSITIVE%2C+T_DISTINCT%2C+T_IN%28%3Fs%29%2CT_OUT%28%3Fsubject%29%2CT_MIN%280%29%29}&format=text%2Fhtml&timeout=30000&debug=on
>
> Is there something wrong with my query, or is the category tree in
> Wikipedia that strange? Trying other subjects gives me equally weird
> results.
>
> Thank you for your support,
> Heiko
>
> --
> Dr. Heiko Paulheim
> Research Group Data and Web Science
> University of Mannheim
> Phone: +49 621 181 2646
> B6, 26, Room C1.08
> D-68159 Mannheim
>
> Mail: he...@informatik.uni-mannheim.de
> Web: www.heikopaulheim.com
>
>
>
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