Re: U-labels and draft-obispo-epp-idn-00

I agree with Andrew for including an optional "U-label" element. Server policy can dictate how it is used.

> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On
> Behalf Of Andrew Sullivan
> Sent: Wednesday, 15 February 2012 8:25 AM
> To: [email protected]
> Subject: [provreg] U-labels and draft-obispo-epp-idn-00
> 
> Hi,
> 
> draft-obispo-epp-idn-00 includes a mechanism for indicating some sort
> of code point selector (there called a language tag).  I mentioned
> before my reservation about this term "language tag", and suggested
> that future developments would likely make something more generic
> somewhat more useful (even if we continue to use RFC 5646 to generate
> the tags that serve as identifiers, as I think we should).
> 
> I noted today, however, another thing that bugs me.  RFC 5731 makes
> the <domain:name> data conform to RFC 952 as updated by RFC 1123.
> At the risk of oversimplifying, this is the LDH rule.
> 
> RFC 5891 section 4.1 suggests that it would be desirable to require
> both the A-label and U-label as input, so that the registry side could
> valdate whether the A-label actually corresponds to the desired
> U-label.  I know that some don't think this is a good policy to have,
> but that's not relevant for this discussion; the question is, if
> someone were going to implement such a policy, how could they?
> 
> I'm wondering whether we couldn't make an optional element in this
> proposed extension that would contain the name in U-label form.  In
> other words, in the U-label format, A-labels wouldn't be allowed.
> 
> A repository, on receiving this, could validate that the A-label and
> U-label matched.  If they did not, it would be an error.
> 
> Thoughts?
> 
> A
> 
> 
> --
> Andrew Sullivan
> [email protected]
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