On 02/02/2001 09:29:08 AM Elaine Keown wrote:
>What version of ISO 10646-x is the same as Unicode 3.0? Are there ISO
updates
>each time that correspond to the Unicode 3.0.1 and so forth?
I'll add to the answers John Cowan gave (all of which are correct). Unicode
and ISO are synchronised, meaning that the coded character sets are kept
identical. Characters are added only after both bodies have ratified them.
(This entails an answer to your later question about the various blocks: if
it's in Unicode, it's in ISO 10646, and vice versa.) The two standards
differ in their versioning systems, however. Unicode regularly makes
version updates, with three levels of numbering. As John indicated, the
lowest level changes in Unicode generally are not reflected in ISO 10646
since they cover things that go beyond that standard. The major change to
Unicode 3.0 (from 2.x) corresponds to the change from ISO 10646-1:1996 to
ISO 10646-1:2000. It's the intermediate level changes that get confusing:
The changes from Unicode 3.01 to 3.1 will largely be embodied in ISO
10646-2:200x, which will supplement rather than replace ISO 10646-1:2000.
Also, many of scripts added to Unicode 3.0 were treated prior to ISO
10646-1:2000 as amendments to ISO 10646-1:1996, and it's possible that
similar amendments might be used in the future. So, the two are handled
rather differently.
- Peter
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Peter Constable
Non-Roman Script Initiative, SIL International
7500 W. Camp Wisdom Rd., Dallas, TX 75236, USA
Tel: +1 972 708 7485
E-mail: <peter_constable@sil.org>
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