I am trying to check for the existence of a graph and if I execute this
query in the Conductor
ASK { GRAPH <http://example.org/tests/graph/001> { ?s ?p ?o . } }
returns 'false' when the graph is not there.
However, if I run the same query with Jena and the Virtuoso Jena Provider I
always get back 'true':
VirtGraph set = new VirtGraph ("jdbc:virtuoso://localhost:1111", "*dba*", "
*dba*");
String query = "ASK { GRAPH <http://example.org/tests/graph/001> { ?s ?p ?o
. } }";
Query sparql = QueryFactory.create(query);
VirtuosoQueryExecution vqe = VirtuosoQueryExecutionFactory.create (sparql,
set);
boolean result = vqe.execAsk();
Any advice that can help me out?
Thank you in advance,
Paolo
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