RDF.rb 0.3.0 BGP query example

bgp-query.rb

#!/usr/bin/env ruby1.9
require 'rdf'
require 'rdf/ntriples'

RDF::Repository.load('http://rdf.rubyforge.org/doap.nt') do |rdf|
  bgp = RDF::Query.new do
    self << [:person, RDF.type, RDF::FOAF.Person]
    self << [:person, RDF::FOAF.name, :name]
    self << [:person, RDF::FOAF.mbox, :email]
  end

  bgp.execute(rdf).each do |solution|
    p solution.to_hash
  end
end

#=> {:person => #<RDF::URI(http://ar.to/#self)>,
#=>  :name   => #<RDF::Literal("Arto Bendiken")>
#=>  :email  => #<RDF::URI(mailto:[email protected])>}
#=> {:person => #<RDF::URI(http://bhuga.net/#ben)>,
#=>  :name   => #<RDF::Literal("Ben Lavender")>
#=>  :email  => #<RDF::URI(mailto:[email protected])>}