Question: How many books have been penned by Miguel de Cervantes?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE {?uri onto:author <http://dbpedia.org/resource/Miguel_de_Cervantes>  . ?uri rdf:type onto:Book}