Question: How many owners are there of lines starting at the South Station?
SPARQL query:
PREFIX res: <http://dbpedia.org/resource/>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x onto:routeStart <http://dbpedia.org/resource/South_Station> . ?x prop:owner ?uri . }