Question: Count the different number of academic areas covered by publications of SAGE?
SPARQL query:
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x prop:publisher <http://dbpedia.org/resource/SAGE_Publications> . ?x onto:academicDiscipline ?uri  . }