ASK WHERE { <http://dbpedia.org/resource/Callisto_(moon)> <http://dbpedia.org/property/discoverer> <http://dbpedia.org/resource/Galileo_Galilei> }
Was Castillo discovered by Galileo?
ASK WHERE { resource:Callisto_(moon) property:discoverer resource:Galileo_Galilei }
Yes
[Yes], Galileo Galilei is the discoverer of Callisto.
[Yes] Galileo Galicia is Callisto's discoverer.
[Yes], he is the discoverer of Callisto.
[Yes] Callisto's discoverer is him.