ruby-sparql issue

construct_bound.rq

PREFIX ex: <http://example.com/>

CONSTRUCT {
  [] ex:label "Should appear once" .
}
WHERE {
  [] a ex:bound .
}

construct_not_bound.rq

PREFIX ex: <http://example.com/>

CONSTRUCT {
  [] ex:label "Should appear once" .
}
WHERE {
  OPTIONAL {
    ?s ?p ex:not-bound .
  }
  FILTER (!bound(?s))
}

foo.ttl

@prefix ex: <http://example.com/> .

[] a ex:bound .
[] a ex:somethingElse .

Gemfile

source :rubygems

gem 'rdf-turtle'
gem 'rdf-rdfa'
gem 'sparql'
gem 'equivalent-xml'

queries_check.rb

require 'rdf/turtle'
require 'rdf/rdfa'
require 'sparql'

repository  = RDF::Repository.load(File.expand_path('foo.ttl', File.dirname(__FILE__)), format: :turtle)
query_files = Dir[File.expand_path('*.rq', File.dirname(__FILE__))]

query_files.each do |query_file|
  puts "* Processing file #{query_file.split('/').last}", "="*50, ""

  query = File.read(query_file)

  puts query, "", "-"*50

  solutions = SPARQL.execute(query, repository)

  puts "found #{solutions.size} #{solutions.size > 1 || solutions.size == 0 ? "results" : "result"}", (solutions.dump(:turtle) rescue solutions.inspect), "", "="*50, ""
end