Question: Did Fritz Lang's (the one who speaks German) work start before 1993?
Choices: yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
SPARQL: ASK { ?e <pred:name> "Fritz Lang" . ?e <languages_spoken,_written_or_signed> ?e_1 . ?e_1 <pred:name> "German" .  ?e <work_period_(start)> ?pv . ?pv <pred:year> ?v . FILTER ( ?v < 1993 ) .  }
Program:
function: Find
inputs: German
function: Relate
dependencies: 0
inputs: languages spoken, written or signed
backward
function: Find
inputs: Fritz Lang
function: And
dependencies: 1
2
function: QueryAttr
dependencies: 3
inputs: work period (start)
function: VerifyYear
dependencies: 4
inputs: 1993
<
Answer: yes