Question: List presidents of the school whose one of the president is Charles, Prince of Wales?
SPARQL query: SELECT DISTINCT ?uri WHERE { ?x <http://dbpedia.org/ontology/president> <http://dbpedia.org/resource/Charles,_Prince_of_Wales> . ?x <http://dbpedia.org/property/president> ?uri  . ?x <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/School>}
Answer: The presidents of the schools whose one president is Charles, Prince of Wales are [Nelson Mandela, Queen Noor of Jordan, Louis Mountbatten, 1st Earl Mountbatten of Burma, Charles, Prince of Wales, The Prince of Wales].