Question: In how many nations does Rhaetian Railways own train stations?
SPARQL:
SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/ontology/owningOrganisation> <http://dbpedia.org/resource/Rhaetian_Railway> . ?x <http://dbpedia.org/ontology/country> ?uri  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Country>}