Sorry, something went wrong with the qtxt URL in my mail before:
here it goes:
http://dbpedia.org/sparql?default-graph-uri=http%3A%2F%2Fdbpedia.org&qtxt=SELECT+%3Ftype+WHERE+%7B%0D%0A%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FJohn_the_Baptist%3E+a+%3Ftype+.%0D%0AFILTER+NOT+EXISTS%7B%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FJohn_the_Baptist%3E+a+%0D%0A%3FmoreSpecificType+.%0D%0A%3FmoreSpecificType+%3Chttp%3A%2F%2Fwww.w3.org%2F2000%2F01%2Frdf-schema%23subClassOf%3E%2B+%3Ftype.%7D%0D%0A%7D&format=text%2Fhtml&timeout=300000&debug=on
Thanks again,
Lorenz Bühmann
On 02/06/2014 02:22 PM, Kingsley Idehen wrote:
On 2/6/14 7:57 AM, Lorenz Bühmann wrote:
Hi,
I just wanted to report some unexpected behaviour when running the
following query on http://dbpedia.org/sparql :
SELECT ?type WHERE {
<http://dbpedia.org/resource/John_the_Baptist> a ?type .
FILTER NOT EXISTS{<http://dbpedia.org/resource/John_the_Baptist> a
?moreSpecificType .
?moreSpecificType <http://www.w3.org/2000/01/rdf-schema#subClassOf>+
?type.}
}
It's supposed to return all types of
http://dbpedia.org/resource/Saint_George that do not have a subclass
which is also an asserted type of
http://dbpedia.org/resource/Saint_George. But in fact it returns, among
others,
http://www.w3.org/2002/07/owl#Thing
http://dbpedia.org/ontology/Agent,
http://dbpedia.org/ontology/Person,
http://dbpedia.org/ontology/Saint
which are indeed related via rdfs:subClassOf.
For some other resources it seems to work, e.g. for the resource
http://dbpedia.org/resource/Pope_John_Paul_I it returns, among others,
only the class http://dbpedia.org/ontology/ChristianBishop from the
DBpedia ontology namespace.
Am I doing something wrong, or is this a (known) bug in Virtuoso?
Regards,
Lorenz Bühmann
To accelerate case resolution please do the following:
1. Grab the SPARQL Protocol URL for you query -- this can be the
solution or the definition (replace &query with &qtxt)
2. Reference the URL in your post.
Instinctively, I suspect this is a combination of timeout setting
(which you could increase to 30,000 msecs) and enabling inference
context (using one of the pre-canned inference rules).
Send the SPARQL Protocol URL and the query could be tweaked
accordingly. Worst case, the issue will be found pronto.
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