[Simple] Re: [Geopriv] Domain identifier in common policy

[Henning Schulzrinne <hgs at cs.columbia.edu>]

> Given Jonathan's comment, I thought he was more focused on actual  
> domain names and not IP addresses.  I don't care.  I just thought  that 
> was what was said.

Right; I just want to make sure we don't get into an IPv4 vs. IPv6 
discussion.

> Even if the domain field is limited to ireg-name, I do not believe  that 
> solves the problem.  I'm not an IRI expert, but it appears that  not all 
> ireg-name values are legal domain names.

Sure, but this is not a new problem. example.andy, ccs.columbia.edu or 
ex$ample.com are not valid domain names, either, even without the I18N 
problems. Thus, there will always be valid domain-looking strings that 
don't match any protocol-possible string. This isn't an issue - the rule 
 component just will never match and somebody will have to fix the typo.


> And I still wonder about the IDN case, especially given that this  
> appears to be an exact match.  Which form is the exact match  performed 
> on, the UTF8, a NamePrepped domain, or an ACE encoded  domain.  Given 
> that there can be variants of an IDN floating around  on the wire, it 
> always seems to me that the comparison should be done  on the ACE version.

I may be looking at the wrong thing, but Section 5 of RFC 3987 seems 
relevant:

 5.  Normalization and Comparison . . . . . . . . . . . . . . . . . 21
       5.1.  Equivalence  . . . . . . . . . . . . . . . . . . . . . . 22
       5.2.  Preparation for Comparison . . . . . . . . . . . . . . . 22
       5.3.  Comparison Ladder  . . . . . . . . . . . . . . . . . . . 23
             5.3.1.  Simple String Comparison . . . . . . . . . . . . 23
             5.3.2.  Syntax-Based Normalization . . . . . . . . . . . 24
             5.3.3.  Scheme-Based Normalization . . . . . . . . . . . 27
             5.3.4.  Protocol-Based Normalization . . . . . . . . . . 28


> If there is somebody with better IDN-in-IRI clue, please correct me.
>
> -andy

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