Question: Was the wife of president Lincoln called Mary?
SPARQL:
PREFIX dbo: <http://dbpedia.org/ontology/>PREFIX res: <http://dbpedia.org/resource/>PREFIX rdfs: <http://w.w3.org/20/01/rdf-schema#>ASK WHERE { res:Abraham_Lincoln dbo:spouse ?spouse . ?spouse rdfs:label ?name . FILTER(regex(?name,'Mary') }