gistfile1.rb

require "rdf"
require "rdf/n3"
require "rdf/ntriples"

graph = RDF::Graph.load("/Users/tom/Downloads/uk.n3")
graph.each_subject do |station|
  station_graph = RDF::Graph.load(station.to_s.sub("resource", "data").gsub(/$/, ".ntriples"))
  query = RDF::Query.new({
    :station => {
      RDF::FOAF.name => :name,
    }
  })
  
  query.execute(station_graph).each do |solution|
    graph << [station, RDF::FOAF.name, solution.name]
  end
end

RDF::Writer.open("/Users/tom/Downloads/uk_parsed.n3") do |writer|
  graph.each_statement do |statement|
    writer << statement
  end
end