Question: Count all those whose youthclub performed at the 14-15 La Liga?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX prop: <http://dbpedia.org/property/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT COUNT(?uri) WHERE { ?x onto:season <http://dbpedia.org/resource/2014–15_La_Liga> . ?uri prop:youthclubs ?x  . ?uri rdf:type onto:Athlete}