Question: List the origin of the weapons which were used in the American Revolutionary War.
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { ?x onto:usedInWar <http://dbpedia.org/resource/American_Revolutionary_War> . ?x prop:origin ?uri  . ?x rdf:type onto:Weapon}