Question: When did Stephen Harper become the chairperson of the Conservative Party of Canada (the one whose headquarter location is Ottawa)?
Choices: 2004-03-20
2005-12-10
1803-07-22
1996-12-01
2008-08-16
1944-04-10
1993-09-18
1910
1953-08-19
1960-10-03
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e_1 <pred:name> "Conservative Party of Canada" . ?e_1 <headquarters_location> ?e_3 . ?e_3 <pred:name> "Ottawa" . ?e_2 <pred:name> "Stephen Harper" . ?e_1 <chairperson> ?e_2 . [ <pred:fact_h> ?e_1 ; <pred:fact_r> <chairperson> ; <pred:fact_t> ?e_2 ] <start_time> ?qpv .  }
Program:
function: Find
inputs: Ottawa
function: Relate
dependencies: 0
inputs: headquarters location
backward
function: Find
inputs: Conservative Party of Canada
function: And
dependencies: 1
2
function: Find
inputs: Stephen Harper
function: QueryRelationQualifier
dependencies: 3
4
inputs: chairperson
start time
Answer: 2004-03-20