Question: Which super bowls occured after 1978-01-15 and were won by the Dallas Cowboys?
Answer(s):
answer: Super Bowl XXVIII
answer: Super Bowl XXVII
answer: Super Bowl XXX

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.02896)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.02896 ns:sports.sports_team.championships ?x .
?x ns:time.event.end_date ?num .
FILTER (?num > "1978-01-15"^^xsd:dateTime) . 
}