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