Question: What is the time period that 400000000 is the population of the historical country that is the nation of Guangdong?
Choices: 1939-12-01
2016-10-20
1758
1900
2013-02-24
1810
2009
1637-01-01
2005-03-01
1648-01-01
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "historical country" . ?e_1 <country> ?e . ?e_1 <pred:name> "Guangdong" .  ?e <population> ?pv . ?pv <pred:unit> "1" . ?pv <pred:value> "400000000"^^xsd:double . [ <pred:fact_h> ?e ; <pred:fact_r> <population> ; <pred:fact_t> ?pv ] <point_in_time> ?qpv .  }
Program:
function: Find
inputs: Guangdong
function: Relate
dependencies: 0
inputs: country
forward
function: FilterConcept
dependencies: 1
inputs: historical country
function: QueryAttrQualifier
dependencies: 2
inputs: population
400000000
point in time
Answer: 1900