Question: How many companies have manufactured the rockets launched from the Cape Canaveral Air Force Station?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x onto:launchSite <http://dbpedia.org/resource/Cape_Canaveral_Air_Force_Station> . ?x onto:manufacturer ?uri . }