Tables: BackwardCompatible Maintanence

[Vint Cerf]

Patrik, Mark,

taking both of your points.

Mark,

how would backward compatibility be expressed? What action would one  
want implementors to take to implement it? perhaps an example would  
inform the working group?

vint


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On Nov 19, 2008, at 9:43 PM, Patrik Fältström wrote:

> On 19 nov 2008, at 10.17, Mark Davis wrote:
>
>> BackwardCompatible MaintanenceChanges to BackwardCompatible are a
>> completely
>> different beast than adjustments to PVALID and DISALLOWED. The
>> latter we can
>> hope to never happen. But changes to BackwardCompatible
>> MUST be done to preserve backwards compatibility, it is not an
>> option! And
>> we know that there is a non-zero likelyhood that this will happen
>> with each
>> Unicode version (every year or so).The BackwardCompatible list, like
>> the
>> Context Rules Registry, should be under the aegis of IANA, with
>> precise and
>> strict instructions to add exactly (all and only) those characters
>> necessary
>> to preserve backwards compatibility with each new version of
>> Unicode. This
>> is not a new concept: BCP 47 (RFC 4646) has a section describing
>> exactly
>> what to do with each new version of a source ISO standard. The  
>> textual
>> changes to do this are small, and I can supply suggested text.
>
> Point taken.
>
> My suggestion is though that we wait with potentially doing this
> change until we actually have a point in time when we need to add
> something to this list.
>
> My action if wg chair does not tell me we have consensus for any other
> specific changes is to do nothing.
>
>> *Minor*
>>
>> This document uses different reference names for the same documents,
>> eg
>> [TR15]. All of the IDNA2008 documents should use the same notation  
>> for
>> common references.
>
> Synchronization of references is something we will do closer to time
> of publication.
>
>     Patrik
>
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