code: def to_georss(*args)
        xml = Geos::Helper.xml_options(*args)[0]
        xml.georss(:where) do
          xml.gml(:Point) do
            xml.gml(:pos, "#{self.lat} #{self.lng}")
          end
        end
      end
docs: Build some XmlMarkup for GeoRSS. You should include the
   appropriate georss and gml XML namespaces in your document.