Question: Since when is a city/town, whose country was, until 1st March 1917, Russian Empire, officially named Harkiv ?
Choices: 1990
1812-01-01
1997-01-01
1995-09-04
1992-09-22
1791
1581-07-26
2012-02-03
2009-07-21
2017-10-06
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "city/town" . ?e <country> ?e_1 . ?e_1 <pred:name> "Russian Empire" . [ <pred:fact_h> ?e ; <pred:fact_r> <country> ; <pred:fact_t> ?e_1 ] <end_time> ?qpv_1 . ?qpv_1 <pred:date> "1917-03-01"^^xsd:date . ?e <official_name> ?pv . ?pv <pred:value> "Harkiv" . [ <pred:fact_h> ?e ; <pred:fact_r> <official_name> ; <pred:fact_t> ?pv ] <start_time> ?qpv .  }
Program:
function: Find
inputs: Russian Empire
function: Relate
dependencies: 0
inputs: country
backward
function: QFilterDate
dependencies: 1
inputs: end time
1917-03-01
=
function: FilterConcept
dependencies: 2
inputs: city/town
function: QueryAttrQualifier
dependencies: 3
inputs: official name
Harkiv
start time
Answer: 1990