For those interested in the details of why iso-2022-jp is not
conforming, please see below. The draft in the meantime came
out as an RFC, but I don't remember the number.
> From: Internet-Drafts@ietf.org
> Reply-to: Internet-Drafts@ietf.org
> Subject: I-D ACTION:draft-yamamoto-charset-iso-2022-jp-00.txt
> Date: Tue, 11 Nov 1997 09:29:03 -0500
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> Title : Japanese Character Encoding for Internet Messages
> Author(s) : E. Wada, J. Murai, K. Yamamoto
> Filename : draft-yamamoto-charset-iso-2022-jp-00.txt
> Pages : 14
> Date : 10-Nov-97
> This memo describes the encoding used in electronic mail, NetNews,
> and world wide web messages in Japanese networks. It was first
> specified by and used in JUNET then described in RFC 1468. The name
> of this encoding was originally known as ''JUNET code'' and is now
> called ''ISO-2022-JP'' when used in the context of MIME.
> In ISO-2022-JP text, both one 7-bit byte Latin script (ASCII or JIS
> X 0201 Latin set) and two 7-bit bytes Kanji, Hiragana, Katakana and
> some other symbols and characters (JIS X 0208) are employed.
> Switching the graphic character sets is based on the extension
> techniques defined in ISO 2022.
> This memo eliminates some ambiguities of RFC 1468. However, it
> NEVER introduces any essential changes against RFC 1468. Since the
> encoding is now widely used in Japanese IP communities, backward
> compatibility is most important in this revision.
> This memo revises RFC 1468 on the following points:
> 1. It is clarified that ISO-2022-JP does NOT conform to ISO 2022.
> 2. The formal syntax is divided into two new yet compatible rules,
> namely, ISO-2022-JP decoding syntax and ISO-2022-JP encoding
> 3. The bit combinations permitted in JIS X 0208 are explicitly
> described in the syntax so that the invalid character positions
> will be excluded in ISO-2022-JP text.
> 4. Recommended graphic character sets are specified. That is, ASCII
> is RECOMMENDED rather than JIS X 0201 1976 Latin set. ONLY to
> embed YEN SIGN and OVER LINE, JIS 0201 Latin set MAY be used.
> Also, JIS X 0208 1983 (including 1990) is RECOMMENDED rather
> than JIS X 0208 1978.
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