Question: Who wrote the play in which Blanche DuBois is a character?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { ?x prop:characters <http://dbpedia.org/resource/Blanche_DuBois> . ?x prop:writer ?uri  . ?x rdf:type onto:Play}