Question: Count all those who've played for the youth club which owns the Rosario, Santa Fe stadium.
SPARQL query: SELECT DISTINCT COUNT(?uri) WHERE { ?x <http://dbpedia.org/property/ground> <http://dbpedia.org/resource/Rosario,_Santa_Fe> . ?uri <http://dbpedia.org/property/youthclubs> ?x  . }
Answer: There are [138] players who played for the youth club which owns the Rosario, Santa Fe stadium.