Question: List presidents of the school whose one of the president is Charles. Prince of Wales ?
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 ?uri WHERE { ?x onto:president <http://dbpedia.org/resource/Charles,_Prince_of_Wales> . ?x prop:president ?uri  . ?x rdf:type onto:School}