Question: Was the release date 2002-08-18 for Buffy the Vampire Slayer distributed on DVD?
Choices: yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
SPARQL: ASK { ?e <pred:name> "Buffy the Vampire Slayer" . ?e <distribution> ?e_1 . ?e_1 <pred:name> "DVD" .  ?e <publication_date> ?pv . ?pv <pred:date> "2002-08-18"^^xsd:date .  }
Program:
function: Find
inputs: DVD
function: Relate
dependencies: 0
inputs: distribution
backward
function: Find
inputs: Buffy the Vampire Slayer
function: And
dependencies: 1
2
function: QueryAttr
dependencies: 3
inputs: publication date
function: VerifyDate
dependencies: 4
inputs: 2002-08-18
=
Answer: yes