Invalidate changes (new and/or modified elements)
console.log("XmlStore.revert() _newItems=" + this._newItems.length); console.log("XmlStore.revert() _deletedItems=" + this._deletedItems.length); console.log("XmlStore.revert() _modifiedItems=" + this._modifiedItems.length); this._newItems = []; this._restoreItems(this._deletedItems); this._deletedItems = []; this._restoreItems(this._modifiedItems); this._modifiedItems = []; return true; //boolean