Question: How many progressive rock renditions originate in the sovereign state that is the country of Pisa starting on the date 1860-03-22?
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SPARQL: SELECT (COUNT(DISTINCT ?e) AS ?count) WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "progressive rock" . ?e <country_of_origin> ?e_1 . ?e_1 <pred:instance_of> ?c_1 . ?c_1 <pred:name> "sovereign state" . ?e_2 <country> ?e_1 . ?e_2 <pred:name> "Pisa" . [ <pred:fact_h> ?e_2 ; <pred:fact_r> <country> ; <pred:fact_t> ?e_1 ] <start_time> ?qpv . ?qpv <pred:date> "1860-03-22"^^xsd:date .   }
Program:
function: Find
inputs: Pisa
function: Relate
dependencies: 0
inputs: country
forward
function: QFilterDate
dependencies: 1
inputs: start time
1860-03-22
=
function: FilterConcept
dependencies: 2
inputs: sovereign state
function: Relate
dependencies: 3
inputs: country of origin
backward
function: FilterConcept
dependencies: 4
inputs: progressive rock
function: Count
dependencies: 5
Answer: 0