docs: function(options) {
          // compile regular expressions once instead of every time they are used
          this.regExes = {
              trimSpace: (/^\s*|\s*$/g),
              removeSpace: (/\s*/g),
              splitSpace: (/\s+/),
              trimComma: (/\s*,\s*/g)
          };
          OpenLayers.Format.XML.prototype.initialize.apply(this, [options]);
      }