Question: Who is  office holder of constituencies Duboce Triangle and Noe Valley ?
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 { ?uri prop:constituency <http://dbpedia.org/resource/Duboce_Triangle,_San_Francisco> . ?uri prop:constituency <http://dbpedia.org/resource/Noe_Valley,_San_Francisco> . ?uri rdf:type onto:OfficeHolder}