Comments on draft-ietf-idnabis-defs-10

[Patrik Fältström]

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."

    Patrik