Mapping and Variants

[Debbie Garside]

 Michel wrote:

> In other words, it is way too complicated to be enshrined in
> a protocol where stability is a feature. It is better done by
> registry policies and client application awareness. And it
> needs to be adjusted as new threats emerge while respecting
> real need for multi-script labels when no harm potential exists.

I agree.

Debbie

> -----Original Message-----
> From: idna-update-bounces at alvestrand.no
> [mailto:idna-update-bounces at alvestrand.no] On Behalf Of
> Michel SUIGNARD
> Sent: 10 March 2009 05:19
> To: Vint Cerf
> Cc: idna-update at alvestrand.no
> Subject: RE: Mapping and Variants
>
> +1 on Mark's message concerning confusability.
> I also think that script mixing within a label should be a
> client application decision, not dictated by protocol. For
> many scripts it is in fact innocuous and desirable to be
> mixed with ASCII Latin (take Japanese and Romaji for
> example). In my days at Microsoft, when helping exposing IDN
> in IE7, we went from a fairly restrictive model to a much
> more open model concerning script mixing, clearly banning the
> problematic cases (such as Greek, Cyrillic, Latin mixing),
> but allowing for example most of the Asian scripts to be
> mixed with Latin, and obviously allowing the mixed script
> scenarios required for Japanese and Korean.
> Finally the script property as exposed by Unicode cannot be
> used without some careful analysis to determine 'single'
> script. There are values such as 'Common' and 'Inherited'
> which have to be allowed with most other script values. At
> the same time, 'Common' is a value that often means 'shared'
> by at least two scripts, and it does not mean that all
> 'Common' characters should be mixable with all scripts.
>
> In other words, it is way too complicated to be enshrined in
> a protocol where stability is a feature. It is better done by
> registry policies and client application awareness. And it
> needs to be adjusted as new threats emerge while respecting
> real need for multi-script labels when no harm potential exists.
>
> Michel
>
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