dwr convertXml的bug

读dwr的engine.js源码，看到convertXml这个方法：
[xhtml:showcolumns]
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/** 
   * Marshall an object 
   * @private 
   * @see dwr.engine.serialize.convert() for parameter details 
   */ 
  convertXml:function(batch, referto, data, name, depth) { 
    var output; 
    if (window.XMLSerializer) output = new XMLSerializer().serializeToString(data); 
    else if (data.toXml) output = data.toXml; 
    else output = data.innerHTML; 
    return "xml:" + encodeURIComponent(output); 
  } 

里面用了XMLSerializer，这个在IE6下面不支持。
toXml，ff和ie6下面都undefined，估计是自定义转化xml的方法名吧。
最后一个data.innerHTML，是针对html dom对象的。
如果过传的是对象是构造的xml对象，如下构造的：
[xhtml:showcolumns]
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function stringToXML(xmlData){ 
               if (window.ActiveXObject) {