code: def to_georss(*args)
        xml = Geos::Helper.xml_options(*args)[0]
  
        xml.georss(:where) do
          xml.gml(:LineString) do
            xml.gml(:posList) do
              xml << self.to_a.collect do |p|
                "#{p[1]} #{p[0]}"
              end.join(' ')
            end
          end
        end
      end
docs: Build some XmlMarkup for GeoRSS GML. You should include the
   appropriate georss and gml XML namespaces in your document.