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