Question: Name the university whose affiliations's foundation place is Washington, D.C.?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/foundationPlace> <http://dbpedia.org/resource/Washington,_D.C.> . ?uri <http://dbpedia.org/property/affiliations> ?x  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/University>}