Question: How many owners owned the clubs participating in the Premier leagues of '14?
SPARQL query:
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x onto:season <http://dbpedia.org/resource/2014–15_Premier_League> . ?x prop:owner ?uri  . }