Question: List the people who were the first one to climb a mountain in California?
SPARQL:
SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/locatedInArea> <http://dbpedia.org/resource/California> . ?x <http://dbpedia.org/ontology/firstAscentPerson> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Mountain>}