IAB Statement on Identifiers and Unicode 7.0.0

Vint Cerf vint at google.com
Wed Jan 28 10:39:25 CET 2015

i had something different in mind. What was key to IDNA2008 was the
uniqueness of the UNICODE/PUNYCODE representations. Essentially, after
normalization, one expects that the two strings are unambiguously
equivalent. mapping from normalized unicode to punycode and back should
produce the same (character for character) string. The problem that the
Hamza discussion illustrates, as I understand it, is that there is no
normalization that produces this result if one string uses the combined
character and another uses the composed character sequence - no
normalization produces an unambiguous result.


On Wed, Jan 28, 2015 at 3:43 AM, Mark Davis ☕️ <mark at macchiato.com> wrote:

> On Wed, Jan 28, 2015 at 9:20 AM, Vint Cerf <vint at google.com> wrote:
>> I am reading your message as saying "ambiguity is ok if there are few
>> instances of it" while some of us would like the handling of identifiers
>> encoded with Unicode to be unambiguous.
> The sense of "unambiguous" that matters to users is that when they read a
> sequence of glyphs, their interpretation of the underlying character
> sequence is correct (in normal environments, with common fonts).
> That level of "unambiguous" was impossible, even before Unicode.
> Take 8859-5, with both o and Russian o, or ASCII with "google.corn" vs "
> goog1e.com". [Both the 1 and lowercase L are an issue, but also in many
> fonts—in common use—users will read the (r + n) in the former as an m.]
> To extend Andrew's death analogy, there is no way that we can all live
> forever. However, there are clearly medical processes and social policies
> that can improve and extend the years that we all have. But to be
> productive, the focus needs to be on the big ticket items, and thus needs
> to be prioritized by real data.
> Mark <https://google.com/+MarkDavis>
> *— Il meglio è l’inimico del bene —*
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