Question: Was Mark Johnson (the one whose position is catcher) born before 1969?
Choices:
yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
Program:
function: Find
inputs: catcher
function: Relate
dependencies: 0
inputs: position played on team / speciality
backward
function: Find
inputs: Mark Johnson
function: And
dependencies: 1
2
function: QueryAttr
dependencies: 3
inputs: date of birth
function: VerifyYear
dependencies: 4
inputs: 1969
<
SPARQL: ASK { ?e <pred:name> "Mark Johnson" . ?e <position_played_on_team_/_speciality> ?e_1 . ?e_1 <pred:name> "catcher" .  ?e <date_of_birth> ?pv . ?pv <pred:year> ?v . FILTER ( ?v < 1969 ) .  }
Answer: no