How do I get a NameTable from an XDocument?

How do I get a NameTable from an XDocument?

It doesn't seem to have the NameTable property that XmlDocument has.

EDIT: Judging by the lack of an answer I'm guessing that I may be missing the point.

I am doing XPath queries against an XDocument like this...

document.XPathSelectElements("//xx:Name", namespaceManager);

It works fine but I have to manually add the namespaces I want to use to the XmlNamespaceManager rather than retrieving the existing nametable from the XDocument like you would with an XmlDocument.