IHasXmlNode and XPathNavigator

Reading the docs on IHasXmlNode I assumed an XPathNavigator object would always implement IHasXmlNode.  The examples always use CreateNavigator() on an XmlDocument object.  I assumed this was just an example.

If I use CreateNavigator() on an XPathDocument object, that XPathNavigator object does not implement IHasXmlNode.  For example:

XmlTextReader reader = new XmlTextReader(@"file.xml"); XPathDocument document = new XPathDocument(reader); XPathNavigator navigator = document.CreateNavigator(); IHasXmlNode inode = navigator as IHasXmlNode;

inode is now null.  Have I made an incorrect assumption