Hi,
I have found the issue, which is probably in sesame. When I execute the
query, but the knowledge base does not contain any axiom, it returns
only the value from the aggregation (0) as a result. Which is quite
unexpected, as it (in my humble opinion) should return no result (empty
result set). When the query is executed and data are present, than it
works as expected.
Pavel
Dne 24.9.2012 8:22, Barry Bishop napsal(a):
Hello Pavel,
Can you provide some more details, please?
Do you mean that you see the expected variable names when calling
TupleQueryResult.getBindingNames(), but that calls to
TupleQueryResult.next().getBindingNames() do not have the expected
variable names? Is this true for every BindingSet?
Best
barry
Barry Bishop
OWLIM Product Manager
Ontotext AD
Tel: +43 650 2000 237
email: [email protected]
skype: bazbishop
www.ontotext.com
On 12/09/12 10:47, Pavel Mička wrote:
Hi,
I am using OWLIM-Lite edition (5.2.5331, Sesame 2.6.8) and I am
querying the system using the following SPARQL query:
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX odra:
<http://kbss.felk.cvut.cz/ontologies/2012/OdraOntology.owl/>
SELECT ?type (COUNT(DISTINCT ?instance) AS ?count) WHERE {
?instance odra:hasType ?type .
}
GROUP BY ?type
In BindingSet I expect 2 bindings (type, count), however the result
contains only count. But the TupleQueryResult contains (correctly)
both of them.
Am I missing something or is this a bug?
Thanks
Pavel Mička
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