code: def xpathNextDescendant(self, ctxt):
          
          if ctxt is None: ctxt__o = None
          else: ctxt__o = ctxt._o
          ret = libxml2mod.xmlXPathNextDescendant(ctxt__o, self._o)
          if ret is None:raise xpathError('xmlXPathNextDescendant() failed')
          __tmp = xmlNode(_obj=ret)
          return __tmp
docs: Traversal function for the "descendant" direction the
            descendant axis contains the descendants of the context
            node in document order; a descendant is a child or a child
             of a child and so on.