RFC 1468 (rfc1468) - Page 2 of 6

Japanese Character Encoding for Internet Messages

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RFC 1468   Japanese Character Encoding for Internet Messages   June 1993

   on March 1st, 1987. Likewise, JIS C 6220 was renamed JIS X 0201.

   The "Roman" character set of JIS X 0201 [JISX0201] is identical to
   ASCII except for backslash () and tilde (~). The backslash is
   replaced by the Yen sign, and the tilde is replaced by overline. This
   set is Japan's national variant of ISO 646 [ISO646].

   The JIS X 0208 [JISX0208] character sets consist of Kanji, Hiragana,
   Katakana and some other symbols and characters. Each character takes
   up two bytes.

   For further details about the JIS Japanese national character set
   standards, refer to [JISX0201] and [JISX0208].  For further
   information about the escape sequences, see [ISO2022] and [ISOREG].

   If there are JIS X 0208 characters on a line, there must be a switch
   to ASCII or to the "Roman" set of JIS X 0201 before the end of the
   line (i.e., before the CRLF). This means that the next line starts in
   the character set that was switched to before the end of the previous

   Also, the text must end in ASCII.

   Other restrictions are given in the Formal Syntax below.

Formal Syntax

   The notational conventions used here are identical to those used in
   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 *single-byte-char *segment
                         single-byte-seq *single-byte-char )
                                           ; see also [MIME1] "body-part"
                                           ; note: must end in ASCII

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

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

   single-byte-segment = single-byte-seq 1*single-byte-char

Murai, Crispin & van der Poel

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