Question: What do you call members of the senate that was an office position held from 1999?
Answer(s):
answer: Chief of staff

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.07t58)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.07t58 ns:government.governmental_body.members ?y .
?y ns:government.government_position_held.basic_title ?x .
?x ns:government.government_office_or_title.office_holders ?c .
?c ns:government.government_position_held.from "1999"^^xsd:dateTime . 
}