Consensus Call on Latin Sharp S and Greek Final Sigma
vint at google.com
Tue Dec 1 05:19:45 CET 2009
We had long since concluded that there should be no mappings within
protocol, either within the lookup procedure or the registration
We agreed to preserve the equivalence of A-label and U-label forms via
We added a non-normative document about mapping for User Interface
purposes. Implicit in that was awareness that context might make a
difference as to choice of mapping.
Re-introduction of mandatory/normative mapping strikes me as old
territory that had been settled.
On Nov 30, 2009, at 9:02 PM, Shawn Steele wrote:
> On 2009/11/30 16:45, Shawn Steele wrote:
>>> I agree with Mark that this is very badly worded.
>> Can you propose (in your eyes) better wording?
> It's easier to say it is badly worded :) I'll try:
> (1) Both characters should be PVALID, the 2003 mappings will break.
> (2) The 2003 mappings MUST be applied to both characters, and both
> characters should be DISALLOWED.
> (3) The 2003 mapping for Greek Small Letter Final Sigma MUST be
> applied, but not the Latin Small Letter Sharp S mapping. The Latin
> Small Letter Sharp S should be PVALID.
> (4) The 2003 mappings for Latin Small Letter Sharp S MUST be
> applied, but not the Greek Small Letter Final Sigma mapping. The
> Greek Small Letter Final Sigma should be PVALID.
> There's a fundamental problem with my wording; it presumes we have
> to have mappings, which opens a different set of problems. Perhaps
> we should start with a consensus call on mappings first:
> (A) No mappings are permitted.
> (B) Only ASCII case mappings are permitted.
> (C) Any mapping MAY be used.
> (D) Only IDNA standard mappings MAY be used, other mappings are
> (E) IDNA standard mappings SHOULD be used, other mappings are
> (F) IDNA standard mappings MUST be used, other mappings are
> That leaves open what an "IDNA standard mapping" is, however I would
> suggest that it be as close to IDNA2003 as possible, eg: UTR46.
> Presumably if we knew mappings MUST NOT, MAY, SHOULD, or MUST be
> used, then we could better agree on what exactly those mappings
> should be.
> As everyone knows already, I would prefer (F) or (E), or reluctantly
> (D). IMO (A) is not practical, (B) is not internationalized, & (C)
> is chaos.
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