Touchstones for "Mapping"

Mark Davis mark at
Wed Mar 25 00:38:16 CET 2009

My reading of the rough consensus at the meeting was to continue with
IDNA2008 (not jump to IDNAv2), but incorporate a mapping phase for
compatibility in the following way:

   1. Disallow mapping in
   2. Require a mapping in
   based on the 2003 mappings
   3. Strongly encourage implementations to only store either the U-Labels
   or A-Labels<>

I think this was the best possible outcome, since it will allow for maximal
backwards compatibility, preventing people from having interoperability
problems, while retaining the key advantages of IDNA2008.

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