RFC 1468 (rfc1468) - Page 2 of 6
Japanese Character Encoding for Internet Messages
Alternative Format: Original Text Document
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
line.
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
