The cloneNode method allows you to copy a node or hierarchy of nodes that do not retain references to their originating DOM Document.

If you wish to clone a single node, do this:

$myClone =& cdCollection->documentElement->cloneNode();

This will return a single node named "cdLibrary". If you also want to clone all subnodes of a node, pass a value of true to the method:

$myDeepClone =& cdCollection->documentElement->cloneNode(true);

This will return the entire node hierarchy of the cd library.