Question: In how many different people are alumini of the University of Oxford working?
SPARQL query:
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x prop:almaMater <http://dbpedia.org/resource/Worcester_College,_Oxford> . ?x onto:field ?uri  . }