Question: List the cast member of the movies whose producer is Mark Johnson.
SPARQL query:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX res: <http://dbpedia.org/resource/>
PREFIX onto: <http://dbpedia.org/ontology/>
SELECT DISTINCT ?uri WHERE { ?x onto:producer <http://dbpedia.org/resource/Mark_Johnson_(producer)> . ?x onto:starring ?uri . ?x rdf:type onto:Film}