gistfile1.rb

get '/gacs/:id' do
  headers['Cache-Control'] = 'public, max-age=43200'
  area = GeographicArea.first(:code=>params[:id])
  halt 404, "Not found" unless area
  if area.superceded_by
    replacement = GeographicArea.get(area.superceded_by)
    redirect "http://purl.org/NET/marccodes/gacs/#{replacement.code}"
  end
  @title = area.pref_label
  @code = area.to_rdf_object
  respond_to do | wants |
    wants.rdf { @code.to_xml() }
    wants.html { haml :gacs }
    wants.txt {@code.to_ntriples() }
  end
end