Turn standard XmlDocument into XPath Document

Author : Rob Lang

URL: http://www.maison-de-stuff.net/rob/

/*
  It's not obvious how you might turn your standard XmlDocument into
  an XPathDocument as there is no direct method to do so. The best way
  is to make use of a reader for the conversion:
*/

XPathDocument xpathDoc = new XPathDocument (new XmlNodeReader(doc));