code: def searchNsByHref(self, doc, href):
          
          if doc is None: doc__o = None
          else: doc__o = doc._o
          ret = libxml2mod.xmlSearchNsByHref(doc__o, self._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.