Removing duplicate elements or attributes

[StillANewbie]

To provide more detail to my previous post, I have the following:

var xmlDoc = new ActiveXObject("Microsoft.XMLDOM")
xmlDoc.async ="false"
xmlDoc.load(ShowScene)
document.all.xmltext.value = xmlDoc.xml

var nodeList = xmlDoc.selectNodes("//");

So once I have done this, how do I filter through nodeList to remove any duplicate attributes or elements? Thanks.

Newbie