anchor.diff:  view_handle.
   
   %% User/group privileges to admin OZ API
  --type oz_privilege() :: view_privileges | set_privileges |
  -add_member_to_group | remove_member_from_group |
  -add_member_to_space | remove_member_from_space |
  -list_users | list_users_of_provider |
  -list_groups | list_groups_of_provider |
  -list_spaces | list_spaces_of_provider |
  -list_providers | list_providers_of_space.
  +-type oz_privilege() :: list_users | list_groups | list_users_of_group |
  +list_groups_of_group | list_spaces | list_providers_of_space | list_providers |
  +list_users_of_provider | list_groups_of_provider | list_spaces_of_provider |
  +view_privileges | set_privileges | add_member_to_group |
  +remove_member_from_group | add_member_to_space | remove_member_from_space |
  +remove_provider.
   
   -export_type([
       privileges/1,
  
positive.code: oz_privileges() ->
      oz_admin().
  
  
negative.code:         remove_member_from_group,
  
          add_member_to_space,
          remove_member_from_space,
  
          remove_provider
      ]).
  
  
  