Evaluate the XPath Location Path in the given context. The
          node 'node' is set as the context node. The context node is
           not restored.

def xpathNodeEval(self, str, ctx):
        """Evaluate the XPath Location Path in the given context. The
          node 'node' is set as the context node. The context node is
           not restored. """
        if ctx is None: ctx__o = None
        else: ctx__o = ctx._o
        ret = libxml2mod.xmlXPathNodeEval(self._o, str, ctx__o)
        if ret is None:raise xpathError('xmlXPathNodeEval() failed')
        return xpathObjectRet(ret)