I am running the following query to give me a list of triples which exist
in one graph but do not exist in another:
SELECT ?s ?p ?o
WHERE {
GRAPH ?from {
?s rdf:type skos:Concept .
?s ?p ?o .
}
MINUS {
GRAPH ?to {
?s ?p ?o .
}
}
}
This works as expected when run via the Conductor SPARQL interface (with
?from and ?to bound correctly) and also works via Jena operating against an
in-memory TDB datastore. But when run via Jena against Virtuoso I get no
results at all.
Any clue as to what is going wrong here?
Thanks
Chris
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