Question: Where was a  movie,  where John Williams (the one that plays the instrument piano) performed, published on 17th January 1991?
Choices: Hollywood Bowl
Czech Republic
Egypt
58th Berlin International Film Festival
Bulgaria
Philippines
Hungary
Vietnam
Germany
Northern America
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "film" . ?e <performer> ?e_1 . ?e_1 <pred:name> "John Williams" . ?e_1 <instrument> ?e_2 . ?e_2 <pred:name> "piano" .  ?e <publication_date> ?pv . ?pv <pred:date> "1991-01-17"^^xsd:date . [ <pred:fact_h> ?e ; <pred:fact_r> <publication_date> ; <pred:fact_t> ?pv ] <place_of_publication> ?qpv .  }
Program:
function: Find
inputs: piano
function: Relate
dependencies: 0
inputs: instrument
backward
function: Find
inputs: John Williams
function: And
dependencies: 1
2
function: Relate
dependencies: 3
inputs: performer
backward
function: FilterConcept
dependencies: 4
inputs: film
function: QueryAttrQualifier
dependencies: 5
inputs: publication date
1991-01-17
place of publication
Answer: Germany