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Re: [Idna-update] IDNA and combining sequences (was: Re: Expiration impending: <draft-klensin-idna-rfc5891bis-01.txt>)

"John R Levine" <johnl@taugh.com> Mon, 12 March 2018 15:03 UTC

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Date: 12 Mar 2018 11:03:54 -0400
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From: "John R Levine" <johnl@taugh.com>
To: "John C Klensin" <john-ietf@jck.com>
Cc: idna-update@ietf.org
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Subject: Re: [Idna-update] IDNA and combining sequences (was: Re: Expiration impending: <draft-klensin-idna-rfc5891bis-01.txt>)
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> Even though it was generally assumed that
> a registry would not allow labels that did not conform to the
> labels it registered, that was never a requirement that anyone
> expected to be enforced at least up to the time those tables got
> entangled with the new gTLD program.

I've tried some experiments and it appears that gTLDs now enforce the 
script rules.  It is certainly true that there is some grandfathered 
garbage from before the IDNA rules, and ccTLDs do what they do.

> (4) I don't know if you are "missing" it or not, but we need to
> keep in mind that efforts to promote the use of DNAME records in
> the root, at the second level, and elsewhere, have potential bad
> side-effects.

No kidding.  DNAME at the second level was so bad that .cat stopped doing 
it.  There is one DNAME at the root, for the two versions of Taiwan in 
Chinese which as far as I can tell nobody has noticed.  But that seems 
like a separate can of worms.

Regards,
John Levine, johnl@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly

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