MACROMEDIA FLASH MX 2004-ACTIONSCRIPT LANGUAGE Reference page 1018

// insert the clone node into rootNode between the middle and youngest nodes
rootNode.insertBefore(middle2, youngest);
trace(rootNode);
// output (with line breaks added):
// <rootNode>
// <oldest />
// <middle />
// <middle />
// <youngest />
// </rootNode>
// create a copy of rootNode using cloneNode() to demonstrate a deep copy
var rootClone:XMLNode = rootNode.cloneNode(true);
// insert the clone, which contains all child nodes,
rootNode.appendChild(rootClone);
trace(rootNode);
// output (with line breaks added):
// <rootNode>
// <oldest />
// <middle />
// <middle />
// <youngest />
// <rootNode>
// <oldest />
// <middle />
// <middle />
// <youngest />
// </rootNode>
// </rootNode>
1018 Chapter 2: ActionScript Language Reference
to rootNode