code: def to_kml(*args)
        xml, options = Geos::Helper.xml_options(*args)
        xml.Point(:id => options[:id]) do
          xml.extrude(options[:extrude]) if options[:extrude]
          xml.altitudeMode(Geos::Helper.camelize(options[:altitude_mode])) if options[:altitude_mode]
          xml.coordinates(self.to_a.join(','))
        end
      end
docs: Build some XmlMarkup for KML. You can set KML options for extrude and
   altitudeMode. Use Rails/Ruby-style code and it will be converted
   appropriately, i.e. :altitude_mode, not :altitudeMode.