Question: How many movies have been directed by Orson Welles ?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE {?uri prop:director <http://dbpedia.org/resource/Orson_Welles>  . ?uri rdf:type onto:Film}