Question: Was Mstislav Rostropovich not born in 1969?
Choices:
yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
Answer: yes
SPARQL: ASK { ?e <pred:name> "Mstislav Rostropovich" . ?e <date_of_birth> ?pv . ?pv <pred:year> ?v . FILTER ( ?v != 1969 ) .  }
Program:
function: Find
inputs: Mstislav Rostropovich
function: QueryAttr
dependencies: 0
inputs: date of birth
function: VerifyYear
dependencies: 1
inputs: 1969
!=