AW: Sharp-S and Final Sigma Consensus Call Results

Vint Cerf vint at
Wed Dec 9 22:02:30 CET 2009

that is correct Andrew. But as we have discovered, Unicode strings  
that may eventually
become input to DNS lookups, for example, may be manipulated prior to  
lookup including mapping.
If there is mapping of one pvalid character into another, it  
introduces an ambiguity
since the string before mapping and the string after mapping may each  
be valid U-labels.

On Dec 9, 2009, at 3:45 PM, Andrew Sullivan wrote:

> On Wed, Dec 09, 2009 at 12:28:31PM -0800, Paul Hoffman wrote:
>> Mapping of PVALID characters is *not* disallowed in draft-ietf- 
>> idnabis-mappings-05.
> I don't know what it would mean to make mapping PVALID characters
> "disallowed".  Mapping isn't part of the protocol, period.  Mapping
> happens _before_ we get to the IDNA step.  No?
> A
> -- 
> Andrew Sullivan
> ajs at
> Shinkuro, Inc.
> _______________________________________________
> Idna-update mailing list
> Idna-update at

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