Question: Was a play based on Oklahoma! (the one whose production company is RKO Pictures) published before 1963?
Choices: yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
SPARQL: ASK { ?e <pred:instance_of> ?c . ?c <pred:name> "play" . ?e_1 <based_on> ?e . ?e_1 <pred:name> "Oklahoma!" . ?e_1 <production_company> ?e_2 . ?e_2 <pred:name> "RKO Pictures" .  ?e <publication_date> ?pv . ?pv <pred:year> ?v . FILTER ( ?v < 1963 ) .  }
Program:
function: Find
inputs: RKO Pictures
function: Relate
dependencies: 0
inputs: production company
backward
function: Find
inputs: Oklahoma!
function: And
dependencies: 1
2
function: Relate
dependencies: 3
inputs: based on
forward
function: FilterConcept
dependencies: 4
inputs: play
function: QueryAttr
dependencies: 5
inputs: publication date
function: VerifyYear
dependencies: 6
inputs: 1963
<
Answer: yes