code: def cd_id_tag(self, for_box_id: bool = False) -> str:
          
  
          if for_box_id:
              return '' if self == Protocol.V_13 else ':tag'
          return 'tag'
docs: Return (place-holder) credential definition identifier tag for current version of node protocol.
          At present, von_anchor always uses the tag of 'tag' if the protocol calls for one.
  
          :param for_box_id: whether to prefix a colon, if current protocol uses one, in constructing
              a cred def id or rev reg id.
          :return: cred def id tag