Substitute for XDocument.XPathSelectElement()

Question

I'm creating a Windows 8 RT app from parts of an existing application. I need to port the following code to a windows store app:

XDocument _doc = new XDocument();
// load document
var x = _doc.XPathSelectElement("Top/List1/Middle/List2/Foo");

Since the XPathSelectElement doesn't exist in the Windows Store, any suggestions on how to rewrite the code?

Thanks...

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Randy