Question: Where was the visual artwork that is shot in Namibia published on 1968-04-02?
Choices: Stockholm
London
Washington, D.C.
Venezuela
Central Park
worldwide
Charlotte Motor Speedway
Greece
2003 Cannes Film Festival
Romania
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "visual artwork" . ?e <filming_location> ?e_1 . ?e_1 <pred:name> "Namibia" .  ?e <publication_date> ?pv . ?pv <pred:date> "1968-04-02"^^xsd:date . [ <pred:fact_h> ?e ; <pred:fact_r> <publication_date> ; <pred:fact_t> ?pv ] <place_of_publication> ?qpv .  }
Program:
function: Find
inputs: Namibia
function: Relate
dependencies: 0
inputs: filming location
backward
function: FilterConcept
dependencies: 1
inputs: visual artwork
function: QueryAttrQualifier
dependencies: 2
inputs: publication date
1968-04-02
place of publication
Answer: Washington, D.C.