docs: function(options) {
          // set state name mapping
          this.stateName = {};
          this.stateName[OpenLayers.State.INSERT] = "wfs:Insert";
          this.stateName[OpenLayers.State.UPDATE] = "wfs:Update";
          this.stateName[OpenLayers.State.DELETE] = "wfs:Delete";
          OpenLayers.Format.XML.prototype.initialize.apply(this, [options]);
      }