Question: Which fictional character is portrayed by Roger Barton (film editor)?
SPARQL:
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/property/portrayer> <http://dbpedia.org/resource/Roger_Barton_(film_editor)>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/FictionalCharacter>}