Question: Which are the presidents of the United States of America?
SPARQL:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX yago: <http://dbpedia.org/class/yago/> PREFIX onto: <http://dbpedia.org/ontology/> PREFIX res: <http://dbpedia.org/resource/> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX prop: <http://dbpedia.org/property/> SELECT DISTINCT ?uri ?string WHERE { { ?uri rdf:type yago:PresidentsOfTheUnitedStates. OPTIONAL {?uri rdfs:label ?string.} FILTER (lang(?string) = "en") } UNION { ?uri rdf:type onto:President. ?uri prop:title res:President_of_the_United_States. OPTIONAL {?uri rdfs:label ?string.} FILTER (lang(?string) = "en") } }