What is the {human} for {official residence} of {Venice}
Where does the mayor of Venice live?
What is the official residence of Venice
SELECT DISTINCT ?b WHERE { ?b rdf:type ontology:human . ?b property:official_residence resource:Venice }
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P263> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q641> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q5> } 
 select distinct ?sbj where { ?sbj wdt:P263 wd:Q641 . ?sbj wdt:P31 wd:Q5 } 
Antonio Rotta