Question: Did David Brown (the one that plays the instrument bass guitar) die before 2008?
Choices: yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
SPARQL: ASK { ?e <pred:name> "David Brown" . ?e <instrument> ?e_1 . ?e_1 <pred:name> "bass guitar" .  ?e <date_of_death> ?pv . ?pv <pred:year> ?v . FILTER ( ?v < 2008 ) .  }
Program:
function: Find
inputs: bass guitar
function: Relate
dependencies: 0
inputs: instrument
backward
function: Find
inputs: David Brown
function: And
dependencies: 1
2
function: QueryAttr
dependencies: 3
inputs: date of death
function: VerifyYear
dependencies: 4
inputs: 2008
<
Answer: yes