Visually confusable characters

Andrew Sullivan ajs at
Sat Aug 9 15:52:52 CEST 2014

On Fri, Aug 08, 2014 at 07:20:49PM -0700, Asmus Freytag wrote:
> If there was an "additional protocol" where problematic cases could
> be identified and translated into a binding requirement on LGRs (and
> therefore registration policies) to either disallow all but one of
> the alternatives, or to have a robust way of mutually excluding
> labels from registration (using the blocked variant mechanism) then
> it would seem that you get the effect of robust lookup, without
> having to arbitrarily play linguistic favorites.

That isn't an additional protocol at all.  That's a modification to
IDNA2008.  IDNA2008 already has rules both about registration and
about lookup.  If you're going to add another level of registration
rules, then obviously that'd have to update IDNA2008 and thereby
create IDNA201n.  Or, much worse, IDNA202n!

Best regards,


Andrew Sullivan
ajs at

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