Question: Give me all libraries established earlier than 1400.
SPARQL query:
PREFIX onto: <http://dbpedia.org/ontology/> PREFIX prop: <http://dbpedia.org/property/> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> SELECT DISTINCT ?uri WHERE { ?uri rdf:type onto:Library . ?uri prop:established ?year . FILTER (?year < 1400) }