code: def searchNsByHref(self, node, href):
          
          if node is None: node__o = None
          else: node__o = node._o
          ret = libxml2mod.xmlSearchNsByHref(self._o, node__o, href)
          if ret is None:raise treeError('xmlSearchNsByHref() failed')
          __tmp = xmlNs(_obj=ret)
          return __tmp
docs: Search a Ns aliasing a given URI. Recurse on the parents
            until it finds the defined namespace or return None
             otherwise.