Question: Does the watershed area of the river officially named the Danube occupy under 490,000 square km?
Choices:
yes
no
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
Answer: no
SPARQL: ASK { ?e <pred:instance_of> ?c . ?c <pred:name> "river" . ?e <official_name> ?pv_1 . ?pv_1 <pred:value> "Danube" . ?e <watershed_area> ?pv . ?pv <pred:unit> "square kilometre" . ?pv <pred:value> ?v . FILTER ( ?v < "490000"^^xsd:double ) .  }
Program:
function: FindAll
function: FilterStr
dependencies: 0
inputs: official name
Danube
function: FilterConcept
dependencies: 1
inputs: river
function: QueryAttr
dependencies: 2
inputs: watershed area
function: VerifyNum
dependencies: 3
inputs: 490000 square kilometre
<