IDNAbis Goals

[Paul Hoffman]

At 9:53 AM -0800 11/27/06, Mark Davis wrote:
>One other restriction that I forgot.
>
>B4. Disallow problematic sequences for normalization
>
>These are listed 
><http://www.unicode.org/reports/tr15/#Corrigendum_5_Sequences>http://www.unicode.org/reports/tr15/#Corrigendum_5_Sequences
>This is a relatively uncontroversial change, even as a hard 
>restriction, since the sequences are degenerate -- not meaningful in 
>any language.

It is premature to call this "uncontroversial", given that many of us 
have never seen it before.

Although the change seems useful, it also looks onerous to put in a 
standard and expect it to be followed reasonably well. One of the 
efforts for IDNAbis was simplification; this is far from simple.