Re: Proposed Update Unicode Technical Standard #46 (Unicode IDNA Compatibility Processing)

From: Markus Scherer (
Date: Wed Sep 22 2010 - 15:21:16 CDT

  • Next message: Martin J. Dürst: "Re: Proposed Update Unicode Technical Standard #46 (Unicode IDNA Compatibility Processing)"

    On Wed, Sep 22, 2010 at 12:34 PM, Colosi, John <> wrote:

    > I think your point is that UTS #46 has a broader scope than just
    > registries, and so it allows the Unicode 6.0 mapping. In fact, it’s very
    > purpose seems to be a bridging of the gap between 2003 and 2008. So in a
    > trivial sense, a strict reading of Idna2008 for registries will cause some
    > issues.

    Yes, IDNA2008 breaks compatibility with IDNA2003 and its many deployed
    implementations. UTS #46 is an attempt to combine the useful upgrades which
    IDNA2008 makes while maintaining compatibility as much as possible.

    Please see the Introduction (section 1) of UTS #46; also, in section 2 it

    *Symbols and Punctuation. *UTS #46 supports processing of symbols and
    punctuation during the transitional period. The transition will be smooth:
    as registries move to IDNA2008 the DNS lookups of IDNs with symbols will
    simply be refused. At that point, in practice, there is full compatibility
    with IDNA2008.

    Best regards,

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