Comments on draft-ietf-idnabis-defs-10

John C Klensin klensin at jck.com
Mon Aug 31 17:37:34 CEST 2009



--On Monday, August 31, 2009 17:34 +0200 Patrik Fältström
<patrik at frobbit.se> wrote:

> On 31 aug 2009, at 17.00, John C Klensin wrote:
> 
>> While several of the other suggestions lead down the path to
>> this one, it is part of the reason why I'm (slightly) in favor
>> of a ban on trying to look up or otherwise use A-labels
>> containing upper case characters.
> 
> "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.

    john



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