Hi
I'd like to select every movie on DBpedia which release date is missing...but I
don't know how to do it. I even tried to put a filter to check if there is an
empty string but it doesn't work. This is how I get started:
PREFIX db-ont: <http://dbpedia.org/ontology/>
PREFIX db-work: <http://dbpedia.org/ontology/Work/>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
SELECT ?id ?uriFB ?data_uscita WHERE {
?id rdf:type db-ont:Film .
?id owl:sameAs ?uriFB .
OPTIONAL {?id db-ont:releaseDate ?data_uscita .}
}
LIMIT 100
Could anybody help me please?
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