Question: Which magazine's editor's official residence is Playboy Mansion?
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 { ?x onto:residence <http://dbpedia.org/resource/Playboy_Mansion> . ?uri prop:editor ?x  . ?uri rdf:type onto:Magazine}