What is {chairperson} of {Harvard University} that is {start time} is {2007-7-1} ?
Who was Harvard university's 2007chair person?
Who was the chairperson of Harvard University in 2007?
SELECT ?g WHERE { FILTER ( CONTAINS ( YEAR ( ?p ) , '2007' ) ) . ?p property:chairperson ?g . ?p property:start_time ?p . resource:Harvard_University property:chairperson ?p }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q13371> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P488> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <2007-7-1>
} 

SELECT ?obj WHERE { wd:Q13371 p:P488 ?s . ?s ps:P488 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'2007')) }