Question: Where is the main ground of soccer seasons whose chairman is Ronaldo?
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { ?x onto:chairman <http://dbpedia.org/resource/Ronaldo> . ?x onto:ground ?uri  . ?x rdf:type onto:SoccerClubSeason}