  TYPE
    nat$network_address_kind = 0 .. 255;

  CONST
    nac$system_address = 0,
    nac$internet_address = 1,
    nac$osi_network_address = 6,
    nac$osi_transport_address = 7,
    nac$osi_session_address = 8,
    nac$osi_presentation_address = 9,
    nac$osi_non_cdna_session_addr = 10,
    nac$osi_non_cdna_present_addr = 11,
    nac$osi_non_cdna_transport_addr = 12;
