Question: In how many nations does Rhaetian Railways own train stations?
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:owningOrganisation <http://dbpedia.org/resource/Rhaetian_Railway> . ?x onto:country ?uri  . ?uri rdf:type onto:Country}