Question: Was the wife of president Lincoln called Mary?
SPARQL query:
PREFIX onto: <http://dbpedia.org/ontology/> PREFIX res: <http://dbpedia.org/resource/> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> ASK WHERE { res:Abraham_Lincoln onto:spouse ?spouse . ?spouse rdfs:label ?name . FILTER(regex(?name,'Mary')) }