Question: What is the publication date of a visual artwork whose main focus is Christopher Columbus (who died on 19th May 1506) ?
Choices: 1984-01-21
2004-05-27
1992-01-01
1925-12-18
2007-08-09
2010-07-29
2003-07-31
2004-09-03
1969
1989-12-26
SPARQL: SELECT DISTINCT ?pv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "visual artwork" . ?e <main_subject> ?e_1 . ?e_1 <pred:name> "Christopher Columbus" . ?e_1 <date_of_death> ?pv_1 . ?pv_1 <pred:date> "1506-05-19"^^xsd:date . ?e <publication_date> ?pv .  }
Program:
function: Find
inputs: Christopher Columbus
function: FilterDate
dependencies: 0
inputs: date of death
1506-05-19
=
function: Relate
dependencies: 1
inputs: main subject
backward
function: FilterConcept
dependencies: 2
inputs: visual artwork
function: QueryAttr
dependencies: 3
inputs: publication date
Answer: 1992-01-01