anchor.diff:  view_handle.
   
   %% User/group privileges to admin OZ API
  --type oz_api_privilege() :: view_privileges | set_privileges | list_spaces |
  +-type oz_privilege() :: view_privileges | set_privileges | list_spaces |
   list_providers | list_providers_of_space | add_member_to_space |
   remove_member_from_space.
  --type oz_api_entity_type() :: od_user | od_group.
   
   -export_type([
       space_privilege/0,
       group_privilege/0,
       handle_service_privilege/0,
       handle_privilege/0,
  -    oz_api_privilege/0, oz_api_entity_type/0
  +    oz_privilege/0,
   ]).
   
   %%%===================================================================
  
positive.code: 
  %% User privileges with regards to handle service.
  -type handle_service_privilege() ::
  %%register_handle_service | list_handle_services | % we may need those privileges for admins in oz_api_privileges
  delete_handle_service | modify_handle_service | view_handle_service |
  register_handle.
  
  
negative.code: -export([handle_service_user/0, handle_service_admin/0,
      handle_service_privileges/0]).
  -export([handle_user/0, handle_admin/0, handle_privileges/0]).
  -export([oz_viewer/0, oz_privileges/0]).
  
  %% User privileges with regards to Space management.
  -type space_privilege() :: space_invite_user | space_remove_user |
  