Question: Did the voice actor of Howard the Duck (the one whose producer is George Lucas) die before 2001?
Choices: yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
SPARQL: ASK { ?e <pred:instance_of> ?c . ?c <pred:name> "human" . ?e_1 <voice_actor> ?e . ?e_1 <pred:name> "Howard the Duck" . ?e_1 <producer> ?e_2 . ?e_2 <pred:name> "George Lucas" .  ?e <date_of_death> ?pv . ?pv <pred:year> ?v . FILTER ( ?v < 2001 ) .  }
Program:
function: Find
inputs: George Lucas
function: Relate
dependencies: 0
inputs: producer
backward
function: Find
inputs: Howard the Duck
function: And
dependencies: 1
2
function: Relate
dependencies: 3
inputs: voice actor
forward
function: FilterConcept
dependencies: 4
inputs: human
function: QueryAttr
dependencies: 5
inputs: date of death
function: VerifyYear
dependencies: 6
inputs: 2001
<
Answer: yes