Question: Which state with a symbol adopted before 1997 is the location of Louisville, NE?
Answer(s):
answer: Nebraska

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0x50_)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0x50_ ns:location.location.containedby ?x .
?x ns:government.governmental_jurisdiction.official_symbols ?c .
?c ns:location.location_symbol_relationship.date_adopted ?num .
FILTER (?num < "1997"^^xsd:dateTime) . 
}