[xml] using xpath on subtree in TextReader

[Nguon Hao Ching <hao magnushost com>]

In the tutorial for TextReader (http://xmlsoft.org/xmlreader.html),
a Python example is shown for using XPath on the subtree returned by
xmlTextReaderExpand, if I understand correctly. However, I am
struggling to find the equivalent way to use an XPath query on the
resulting node in C.

Thanks for any help.

-Hao