Question: What is the total number of other non-fiction subject of the books whose one of the subject is Racism?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x onto:nonFictionSubject <http://dbpedia.org/resource/Racism> . ?x onto:nonFictionSubject ?uri }