referencing IDNA2008 (and IDNA2003?)

[Alireza Saleh]

Thanks John for the answer. By valid i meant a label that corresponds to 
a valid U-label. However it maybe valid under IDNA2003 or 2008

-
Alireza

On 10-10-22 10:53 PM, John C Klensin wrote:
>
> --On Friday, October 22, 2010 22:03 +0330 Alireza Saleh
> <saleh at nic.ir>  wrote:
>
>> So what happened if someone types a vali PunyCode but with
>> capital letters as an address.
> Do you mean "Something that looks like an A-label with one or
> all letters in capitals"?  If so, it isn't a valid IDNA2008
> A-label. However, for IDNA2003 compatibility, I would strongly
> recommend lower-casing ASCII strings that appear to be A-labels
> before processing them) -- fortunately, one of the few things in
> this space we are pretty sure we know how to do is to convert
> all-ASCII strings to lower case.  :-)
>
> If you mean "something that looks like a U-label but that
> contains letters in capitals", it is invalid under IDNA2008 (See
> Rule B, Section 2.2 of RFC 5892).  It would be valid under
> IDNA2003 (because case folding is built into Nameprep), but
> cannot be derived by applying ToUnicode to a valid string
> produced by ToASCII (more or less an A-label).
>
> So I'm not quite sure what you mean by "valid PunyCode".
>
>      john
>
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