Question: Is date of death of Samuel Vincent, citizen of France before 1847?
Choices:
yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
Program:
function: Find
inputs: France
function: Relate
dependencies: 0
inputs: country of citizenship
backward
function: Find
inputs: Samuel Vincent
function: And
dependencies: 1
2
function: QueryAttr
dependencies: 3
inputs: date of death
function: VerifyYear
dependencies: 4
inputs: 1847
<
SPARQL: ASK { ?e <pred:name> "Samuel Vincent" . ?e <country_of_citizenship> ?e_1 . ?e_1 <pred:name> "France" .  ?e <date_of_death> ?pv . ?pv <pred:year> ?v . FILTER ( ?v < 1847 ) .  }
Answer: yes