Question: What is the main language in the location where the film "The Runaway Troupe of the Cartesian Theater" is set?
Answer(s):
answer: Standard Chinese

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:film.film_location.featured_in_films ns:m.0xn1_v_ . 
?c ns:location.country.official_language ?x .
}