Re: draft-kong-epp-cdn-dnssec-mapping-00 Submitted for Review

Hi Andrew,

On 26.10.2011 12:42, Andrew Sullivan wrote:
> On Wed, Oct 26, 2011 at 12:21:15PM +0200, Jens Wagner wrote:
>> Furthermore, I'd prefer if there's no redundancy in responses, e.g.
>> variants should be returned in punycode only.
> I don't think you can do that.  The Punycode form of IDNA2003 labels
> is not lossless, so while you get what is in the DNS, you don't know
> what the input string for the label was.
>
> You could return only the A-label, of course, for IDNA2008, because
> there's no ambiguity there (each A-label corresponds to exactly one
> U-label).  But we're not in an IDNA2008-only world yet, and if you'd
> meant to stick to IDNA2008, you'd have said "A-label" instead.
>
for now, the extension needs to cover IDNA2003 too, imho we can't stick 
to IDNA2008 in the forseeable future.
But - do we need the unicode labels at all? The set of 'usable' domain 
names always matches the set of them encoded in punycode.

>> <var:domain type='simplified-chinese'>xn--fiqu1az03c18t.cn</var:domain>
>> <var:domain type='traditional-chinese'>xn--fiq228c54pg81a.cn</var:domain>
>> <var:domain type='variant'>xn--fsq470a.xn--fiqz9s</var:domain>
>> </var:list>
>> </var:infData>
>>
>> should do, where type is a text attribute, and could be e.g.
>> 'simple-chinese', 'traditional-chinese' and so on. For management
>> purposes, the type doesn't really matter.
> Where are these types going to come from?  The term "variant", I have
> to say, has been so miserably overloaded that we have serious
> problems with using it.

I've just made up some random types. For technical purposes, they don't 
matter, but as Ning's draft even defined different element names for 
them, I included them as an type. Instead of using some generic 
type='variant', it could be omitted, e.g.:

<var:domain>xn--fsq470a.xn--fiqz9s</var:domain>

The only purpose of the extension would be, that a registry can list all 
manageble domains derived from an original domain, right?

Best,
-jens

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