What is the {human} for {director} of {Forrest Gump}
Who is the human chief of Forrest Gump?
Who is the human director of Forrest Gump?
SELECT DISTINCT ?f WHERE { ?f rdf:type ontology:human . resource:Forrest_Gump property:director ?f }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q134773> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P57> . ?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/Q5> } 
 select distinct ?obj where { wd:Q134773 wdt:P57 ?obj . ?obj wdt:P31 wd:Q5 } 
Robert Zemeckis