code: function(geometry) {
          var prefixes = OpenLayers.Style.SYMBOLIZER_PREFIXES;
          for (var i=0, len=prefixes.length; i<len; i++) {
              if (geometry.CLASS_NAME.indexOf(prefixes[i]) != -1) {
                  return prefixes[i];
              }
          }
      }
docs: Method: getSymbolizerPrefix
  Returns the correct symbolizer prefix according to the
  geometry type of the passed geometry
  
  Parameters:
  geometry - {<OpenLayers.Geometry>}
  
  Returns:
  {String} key of the according symbolizer