Question: How many publisher have been founded by american citizens?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x onto:stateOfOrigin <http://dbpedia.org/resource/United_States> . ?uri onto:founder ?x . ?uri rdf:type onto:Publisher}