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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