Question: Was the album that has Grateful Dead as a performer published after 1999?
Choices:
yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
Program:
function: Find
inputs: Grateful Dead
function: Relate
dependencies: 0
inputs: performer
backward
function: FilterConcept
dependencies: 1
inputs: album
function: QueryAttr
dependencies: 2
inputs: publication date
function: VerifyYear
dependencies: 3
inputs: 1999
>
SPARQL: ASK { ?e <pred:instance_of> ?c . ?c <pred:name> "album" . ?e <performer> ?e_1 . ?e_1 <pred:name> "Grateful Dead" .  ?e <publication_date> ?pv . ?pv <pred:year> ?v . FILTER ( ?v > 1999 ) .  }
Answer: no