  TYPE
    nat$network_message_priority = 0 .. 14;

  CONST
    nac$batch_message_priority = 0,
    nac$interact_message_priority = 5,
    nac$real_time_message_priority = 9,
    nac$system_message_priority = 12;

  CONST
    nac$default_message_priority = 0;
