Question: List the books whose authors are in Alcal de Henares.
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/birthPlace> <http://dbpedia.org/resource/Alcalá_de_Henares> . ?uri <http://dbpedia.org/ontology/author> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Book>}