Question: Which fictional character's portrayer was edited by Roger Barton?
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:editing <http://dbpedia.org/resource/Roger_Barton_(film_editor)> . ?uri onto:portrayer ?x  . ?uri rdf:type onto:FictionalCharacter}