I think that rather than trying to define a new defacto usage of
2022, we should just register the existing practice with respect
to 2022. So instead of having a content character set of "ISO-2022",
we should have one for "ISO-2022-jpn-7" (for 2022 encoding, using
the japanese character sets, using a seven bit representation).
If we are talking about country codes, like jpn for Japan, I
will suggest we use the ISO 3166 two-letter codes, which are also
used for internet top domains. For Japan, this is jp.
I do not think we should specify the 7-bit, this is a part of the
specification for this encoding. It would be like also specifying
the character sets included.
This will map very closely to existing practice in Japan, Hong Kong,
Taiwan, PRC, and Korea. I believe this is preferable to trying to
define a new and different usage for ISO-2022. If we're going to
change the way that things work today, we should transition to 10646
instead.
I understand that the 2022 scheme is also used in Korea, and
an appropiate encoding scheme for them, iso-2022-kr should also be
in the specification.
Keld