code: def descending(self, name):
          ''' Add a descending index for ``name`` to this index.
  
              :param name: Name to be used in the index
          '''
          self.components.append((name, Index.DESCENDING))
          return self descending(self, name):
          ''' Add a descending index for ``name`` to this index.
  
              :param name: Name to be used in the index
          '''
          self.components.append((name, Index.DESCENDING))
          return self
docs: Add a descending index for ``name`` to this index.
  
              :param name: Name to be used in the index