Question: Was Ben Harper (the one whose genre is alternative rock) not born in 1972?
Choices:
yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
Answer: yes
SPARQL: ASK { ?e <pred:name> "Ben Harper" . ?e <genre> ?e_1 . ?e_1 <pred:name> "alternative rock" .  ?e <date_of_birth> ?pv . ?pv <pred:year> ?v . FILTER ( ?v != 1972 ) .  }
Program:
function: Find
inputs: alternative rock
function: Relate
dependencies: 0
inputs: genre
backward
function: Find
inputs: Ben Harper
function: And
dependencies: 1
2
function: QueryAttr
dependencies: 3
inputs: date of birth
function: VerifyYear
dependencies: 4
inputs: 1972
!=