Question: How many classes of instruments are used by a drummer?
Choices:
1
2
3
4
5
6
7
8
9
10
Program:
function: Find
inputs: drummer
function: Relate
dependencies: 0
inputs: used by
backward
function: FilterConcept
dependencies: 1
inputs: class of instruments
function: Count
dependencies: 2
SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "class of instruments" . ?e <used_by> ?e_1 . ?e_1 <pred:name> "drummer" .   }
Answer: 1