Question: What is the home field of the teams that particiapated in the 2010 World series?
Answer(s):
answer: AT&T Park

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:time.participant.event ns:m.09gnk2r . 
?c ns:sports.sports_team.arena_stadium ?x .
?x ns:architecture.structure.opened ?sk0 .
}
ORDER BY DESC(xsd:datetime(?sk0))
LIMIT 1