Question: list  the producer of the movies in which Rosemarie DeWitt in the star cast?
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 prop:starring <http://dbpedia.org/resource/Rosemarie_DeWitt> . ?x prop:producer ?uri  . ?x rdf:type onto:Film}