What is the {international airport} for {place served by transport hub} of {Belgrade}
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Which is the international airport for the transport hub of Belgrade?
SELECT DISTINCT ?r WHERE { ?r rdf:type ontology:international_airport . ?r property:place_served_by_transport_hub resource:Belgrade }
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/P931> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q3711> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q644371> } 
 select distinct ?sbj where { ?sbj wdt:P931 wd:Q3711 . ?sbj wdt:P31 wd:Q644371 } 
Belgrade Nikola Tesla Airport