Question: Was Winston Churchill (the one whose date of birth is 1620-04-18) born before 2017?
Choices: yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
SPARQL: ASK { ?e <pred:name> "Winston Churchill" . ?e <date_of_birth> ?pv_1 . ?pv_1 <pred:date> "1620-04-18"^^xsd:date . ?e <date_of_death> ?pv . ?pv <pred:year> ?v . FILTER ( ?v < 2017 ) .  }
Program:
function: Find
inputs: Winston Churchill
function: FilterDate
dependencies: 0
inputs: date of birth
1620-04-18
=
function: QueryAttr
dependencies: 1
inputs: date of death
function: VerifyYear
dependencies: 2
inputs: 2017
<
Answer: yes