Question: How many different people hold authority over the members of Balanidae family?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x onto:family <http://dbpedia.org/resource/Balanidae> . ?x onto:binomialAuthority ?uri . }