Question: What were the names of the three ships by Columbus?
SPARQL query:
PREFIX onto: <http://dbpedia.org/ontology/> PREFIX dct: <http://purl.org/dc/terms/> PREFIX dbc: <http://dbpedia.org/resource/Category:> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> SELECT ?uri WHERE { ?uri rdf:type onto:Ship ; dct:subject dbc:Christopher_Columbus ; dct:subject dbc:Exploration_ships }