How to transform a NodeList into an XPath node set?

[Christian Geuer-Pollmann]

Hi all,

How can I transform an org.w3c.dom.NodeList into an XPath node set on which 
I can use XPath expressions to select nodes?

Example: I use XPathAPI.selectNodeList to get a NodeList; anter that, I 
want to apply another XPath selection to it...

Christian