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Re: [Lucid] Please clarify the i's in Appendix A

Patrik Fältström <paf@frobbit.se> Fri, 20 March 2015 07:03 UTC

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From: Patrik Fältström <paf@frobbit.se>
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Date: Fri, 20 Mar 2015 08:02:58 +0100
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To: Shawn Steele <Shawn.Steele@microsoft.com>
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Subject: Re: [Lucid] Please clarify the i's in Appendix A
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> On 20 mar 2015, at 07:51, Shawn Steele <Shawn.Steele@microsoft.com> wrote:
> 
> U+0130 is disallowed, however most implementations do mapping for lookup, in which case U+0130 changes to U+0069 + U+0307, due to the application of NFKC + Casefolding.  http://www.unicode.org/Public/idna/8.0.0/IdnaMappingTable.txt

Ok, then I understand.

That is though for me very different from IDNA including mapping, which it does not.

> Or is lucid only concerned with the case where no mapping is applied?

Not from my perspective.

But one of the ways IDNA2008 was able to move forward was to, as we all know, ensure mapping was not part of IDNA, just because different contexts required and needed different mappings. And because we really needed in IDNA strict rules for 1:1 mappings between A-label and U-label, and whether codepoints where allowed or not.

So we maybe unfortunately must be a bit precise when we look at solutions, or I am afraid it will be very hard to come to a conclusion.

   Patrik

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