What is the {guitar} for {owner of} of {Willie Nelson}
Willie Nelson's guitar was owned by who?
Who was the owner of Willie Nelson's guitar?
SELECT DISTINCT ?j WHERE { ?j rdf:type ontology:guitar . resource:Willie_Nelson property:owner_of ?j }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q206112> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1830> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q6607> } 
 select distinct ?obj where { wd:Q206112 wdt:P1830 ?obj . ?obj wdt:P31 wd:Q6607 } 
Trigger (guitar)