question: Did M2 star a Chinese writer of a film
query: SELECT count(*) WHERE {
  ?x0 ns:film.writer.film ?x1 .
  ?x0 ns:people.person.nationality ns:m.0d05w3 .
  ?x1 a ns:film.film .
  M2 ns:film.film.starring/ns:film.performance.actor ?x0
  }