Question: Give me the total number of lines owned by owner of Mwtro-Noth Railroad ?
SPARQL query:
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
 SELECT DISTINCT COUNT(?uri) WHERE { ?x onto:owner <http://dbpedia.org/resource/Metro-North_Railroad> . ?x prop:owner ?uri }