Question: What are the political parties whose leaders have lived in the Prime Minister's House?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { ?x onto:residence <http://dbpedia.org/resource/Prime_Minister's_House_(Colombo)> . ?uri onto:leader ?x  . ?uri rdf:type onto:PoliticalParty}