Comments on draft-ietf-idnabis-defs-10

[Patrik Fältström]

On 31 aug 2009, at 17.37, John C Klensin wrote:

>> "An 'xn--' prefixed label MUST before one tries to convert it
>> to a U-label be lowercased. I.e. all ascii characters [A-Z] in
>> the label MUST be mapped to their lowercase variant [a-z] (the
>> label must be turned into an A-label) before removing the
>> 'xn--', and punycode decoding is taking place."
>
> With small editorial adjustments (which I can make), that
> formulation works for me if others are ok with it.

It is VERY important it does not say "...an A-label must be  
lowercased..." because according to the definitions we have today, an  
xn-- prefixed label with uppercase ascii can never be an A-label.

    paf