Re: switching ISO 2022 <-> Unicode

From: Martin J. Duerst (
Date: Sat Jan 18 1997 - 11:06:26 EST

On Fri, 17 Jan 1997 Frank Tang wrote:

> unicode@Unicode.ORG wrote:

[When do we get the Unicode mailing list server set up so that
the original sender appears in such automatically quoted texts?]

> > ISO 2022 has a mechanism to change to other encoding schemes. It would be
> > nice to have a certain control character in Unicode which do a similar thing.
> > Comments?

> I have to say this is a good suggestion but not practicle.
> Why ? Because ISO-2022 is a code switch mechanism. The think make it
> work
> is all the graphic codeset it could switch only use 0x20-0x7F and
> 0xA0-0xFF.
> Since Unicode itself (ISO-10646) does not follow ISO-2022. It will be
> difficult
> to add Unicode into the ISO-2022 scheme.

Please have a close look at ISO 2022! It is a collection of building
blocks, and one of these building blocks is the possibility to
switch to encodings that don't fit the C0/G0/C1/G1 model.
There are two variants, *with* and *without* standard return.
Unicode uses without standard return because of the null bytes and
other things, as explained in some earlier mail on this subject.

Regards, Martin.

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