Question: What is the longest river in the world?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX onto: <http://dbpedia.org/ontology/> select ?uri where { ?uri rdf:type onto:BodyOfWater . ?uri onto:length ?length } ORDER BY DESC(?length) LIMIT 1