Question: Where is the headquarters of the public transit system which owns the American Boulevard (Metro Transit station) located ?
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 { <http://dbpedia.org/resource/American_Boulevard_(Metro_Transit_station)> onto:owningOrganisation ?x . ?x prop:headquarters ?uri  . ?x rdf:type onto:PublicTransitSystem}