RFC 1554 (rfc1554) - Page 3 of 6

ISO-2022-JP-2: Multilingual Extension of ISO-2022-JP

RFC 1554         Multilingual Extension of ISO-2022-JP     December 1993


   Other restrictions are given in the Formal Syntax section below.

Formal Syntax

   The notational conventions used here are identical to those used in
   STD 11, RFC 822 [RFC 822].

   The * (asterisk) convention is as follows:

      l*m something

   meaning at least l and at most m somethings, with l and m taking
   default values of 0 and infinity, respectively.

   message             = headers 1*(CRLF text)
                                          ; see also [MIME1] "body-part"
                                          ; note: must end in ASCII

   text                = *(single-byte-char /
                           g2-desig-seq /
                           single-shift-char)
                          [*segment
                           reset-seq
                           *(single-byte-char /
                             g2-desig-seq /
                             single-shift-char ) ]
                                          ; note: g2-desig-seq must
                                          ; precede single-shift-char

   headers             = RFC 822] "fields" and [MIME1] "body-part">

   segment             = single-byte-segment / double-byte-segment

   single-byte-segment = single-byte-seq
                         *(single-byte-char /
                           g2-desig-seq /
                           single-shift-char )

   double-byte-segment = double-byte-seq
                         *((one-of-94 one-of-94) /
                           g2-desig-seq /
                           single-shift-char )

   reset-seq           = ESC "(" ( "B" / "J" )

   single-byte-seq     = ESC "(" ( "B" / "J" )

   double-byte-seq     = (ESC "$" ( "@" / "A" / "B" )) /



Ohta & Handa