Question: Who is the office holder for constituencies  Castro District and Haight-Ashbury?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?uri <http://dbpedia.org/property/constituency> <http://dbpedia.org/resource/Castro_District,_San_Francisco> . ?uri <http://dbpedia.org/property/constituency> <http://dbpedia.org/resource/Haight-Ashbury> . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/OfficeHolder>}