machine_question: who did darth vaders voice and is the actor that played the character Troy Bolton
question: What actor played the charactor Troy Bolton and also has done the voice of Star Wars villiam Darth Vader?
sparql: PREFIX ns: <http://rdf.freebase.com/ns/>
  SELECT DISTINCT ?x
  WHERE {
  FILTER (?x != ns:m.0f2y0)
  FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
  ns:m.0f2y0 ns:film.film_character.portrayed_in_films ?y .
  ?y ns:film.performance.actor ?x .
  ?y ns:film.performance.special_performance_type ns:m.02nsjvf .
  ?x ns:film.actor.film ?c .
  ?c ns:film.performance.character ns:g.121cr_v1 . 
  }
webqsp_question: who did darth vaders voice