code: def xpathNodeEval(self, str, ctx):
          
          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)
docs: Evaluate the XPath Location Path in the given context. The
            node 'node' is set as the context node. The context node is
             not restored.