Hi Diego,
On 12/24/2012 12:25 PM, Diego Valerio Camarda wrote:
Hi,
I'm trying to list the properties used for each class but a query like
this
select distinct ?Concept where {[] ?Concept ?o.
?o a <http://dbpedia.org/ontology/Person>} LIMIT 100
is too "heavy" for the dbpedia SPARQL endpoint and it dosen't work.
If you are interested in the properties in the ontology namespace you
can use the following query:
SELECT DISTINCT ?property WHERE { ?property rdfs:domain
dbpedia-owl:Person }
but if you are interested in all properties you should use the following
query:
SELECT DISTINCT ?property FROM <http://dbpedia.org> WHERE { ?subject
a <http://dbpedia.org/ontology/Person>. ?subject ?property ?value }
LIMIT 100
But you it's better to run it against endpoint [1], as it is faster, or
against DBpedia-Live endpoint [2].
How can I improve the query?
thanks
diego
Hope that helps.
[1] http://lod.openlinksw.com/sparql
[2] http://live.dbpedia.org/sparql/
--
Kind Regards
Mohamed Morsey
Department of Computer Science
University of Leipzig
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