A colleague pointed out a funny issue to me.
I'm running this SPARQL query against DBpedia (at http://dbpedia.org/snorql
):
SELECT ?P ?T WHERE {
?P rdfs:label "Eyre Square"@en .
OPTIONAL {
?P a ?T .
FILTER (?T=<http://nonsense>)
}
}
I would expect a single result (dbpedia:Eyre_Square) for ?P, and ?T
unbound since obviously the resource is not typed as <http://nonsense>.
But I get a result where ?T is bound to <http://nonsense>. I think
this is a bug, it should be unbound.
Best,
Richard
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