anchor.diff:  -spec group_privileges() -> [group_privilege()].
   group_privileges() ->
       group_admin().
  +
  +%%--------------------------------------------------------------------
  +%% @doc All atoms representing handle_service privileges.
  +%% @equiv handle_service_admin()
  +%%--------------------------------------------------------------------
  +-spec handle_service_privileges() -> [handle_service_privilege()].
  +handle_service_privileges() ->
  +    handle_service_admin().
  +
  +%%--------------------------------------------------------------------
  +%% @doc All atoms representing handle privileges.
  +%% @equiv handle_admin()
  +%%--------------------------------------------------------------------
  +-spec handle_privileges() -> [handle_privilege()].
  +handle_privileges() ->
  +    handle_admin().
positive.code: group_set_privileges | group_remove | group_leave_space |
  group_view_data | group_create_space_token |
  group_join_group | group_invite_group | group_remove_group.
  
  %%%===================================================================
  %%% API
  
negative.code:     ).
  
  %%--------------------------------------------------------------------
  %% @doc A privilege level of a handle_service user.
  %%--------------------------------------------------------------------
  -spec handle_service_user() -> [handle_service_privilege()].
  handle_service_user() ->
      [view_handle_service].
  
  %%--------------------------------------------------------------------
  %% @doc A privilege level of a handle_service administrator. This level contains all
  %% atoms representing handle_service privileges.
  %% @end
  %%--------------------------------------------------------------------
  -spec handle_service_admin() -> [handle_service_privilege()].
  handle_service_admin() ->
      ordsets:union(
          handle_service_user(),
          ordsets:from_list([
              register_handle_service,
              list_handle_services,
              delete_handle_service,
              modify_handle_service,
              view_handle_service
          ])
      ).
  
  %%--------------------------------------------------------------------
  %% @doc A privilege level of a handle user.
  %%--------------------------------------------------------------------
  -spec handle_user() -> [handle_privilege()].
  handle_user() ->
      [view_handle].
  
  %%--------------------------------------------------------------------
  %% @doc A privilege level of a handle administrator. This level contains all
  %% atoms representing handle privileges.
  %% @end
  %%--------------------------------------------------------------------
  -spec handle_admin() -> [handle_privilege()].
  handle_admin() ->
      ordsets:union(
          handle_user(),
          ordsets:from_list([
              register_handle,
              list_handles,
              delete_handle,
              modify_handle,
              view_handle
          ])
      ).
  
  %%--------------------------------------------------------------------
  %% @doc All atoms representing space privileges.
  %% @equiv space_admin()
  %%--------------------------------------------------------------------
  