Question: Which presidents were born in 1945?
SPARQL:
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX onto: <http://dbpedia.org/ontology/> PREFIX yago: <http://dbpedia.org/class/yago/> SELECT DISTINCT ?uri ?string WHERE { { ?uri rdf:type onto:President . ?uri onto:birthDate ?date . FILTER regex(?date,'^1945') . OPTIONAL {?uri rdfs:label ?string . FILTER (lang(?string) = 'en') } } UNION { ?uri rdf:type yago:President. ?uri onto:birthDate ?date . FILTER regex(?date, '^1945') . OPTIONAL {?uri rdfs:label ?string . FILTER (lang(?string) = 'en') } } }