Paul Hoffman wrote:
On Jun 7, 2011, at 6:24 PM, John C Klensin wrote:
I think this is an improvement but there is one issue about
which we have slightly different impressions. I hope the
difference can be resolved without needing yet more tedious
arguments about documentation. Indeed, if such arguments are
required, I'd prefer that we just forget about it.
Anyway, your comments above about "most current version" imply
to me that IANA should keep derived property tables for the most
current version only. My expectation when 5982 was completed
was that IANA was expected to keep derived property tables,
clearly identified by version, for each and every Unicode
version from 5.2 forward. In other words, the tables for the
[most] current version would be added to, not replace, whatever
previous version tables were around. The reasons for this, in
terms of systems and implementations in various stages of
development, implementation, and deployment, seem obvious... but
maybe it was too obvious to some of us at the time to get the
wording exactly right.
That was my impression as well when I reviewed RFC 5982 while on IESG.
While your interpretation could be one thing we might have meant, it is not what is reflected in the RFC or the registry. RFC 5892 says:
5.1. IDNA-Derived Property Value Registry
IANA has created a registry with the derived properties for the
versions of Unicode released after (and including) version 5.2. The
derived property value is to be calculated in cooperation with a
designated expert [RFC5226] according to the specifications in
Sections 2 and 3 and not by copying the non-normative table found in
Appendix B.
If non-backward-compatible changes or other problems arise during the
creation or designated expert review of the table of derived property
values, they should be flagged for the IESG. Changes to the rules
(as specified in Sections 2 and 3), including BackwardCompatible
(Section 2.7) (a set that is at release of this document is empty)
require IETF Review, as described in RFC 5226 [RFC5226].
Note that every reference to the registry is singular.
There is a single registry, but multiple versions of Unicode.
Also, the registry at <http://www.iana.org/assignments/idnabis-tables/idnabis-tables.xml> doesn't mention "5.2" at all.
That might be an error created when the registry got setup by IANA.
If the registry definition does not talk about keeping versions, and the registry itself doesn't look like it tried, it may be implausible to think that IANA would just start to do so in some future. To me, "a registry" means a single registry.
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