Re: [xmpp] [Technical Errata Reported] RFC7622 (5769)

[Peter Saint-Andre <[e-mail]>]

On 7/2/19 1:25 AM, Florian Schmaus wrote:
> On 02.07.19 00:53, Matthias Wimmer wrote:
>> I'd also like to point to http://unicode.org/reports/tr46/#Notation
>>
>> According to the definition there labels are not only separated by
>> U+002E but also three other types of full stops as well.
>>
>> This definition has also been in RFC3490 section 4 (IDNA2003) but I
>> cannot find it explicitly in IDNA2008. Not even in the list of things
>> that have changed.
>>
>> For the given example of 商业.中国 I think a Chinese user would more
>> likely enter 商业。中国 because while entering Chinese characters there
>> is no key on the keyboard, that would enter a Western full stop. So to
>> enter 商业.中国 he would have to change his keyboard layout at least twice.
> 
> Thanks for pointing this out. From RFC3490:
> 
>    1) Whenever dots are used as label separators, the following
>       characters MUST be recognized as dots: U+002E (full stop), U+3002
>       (ideographic full stop), U+FF0E (fullwidth full stop), U+FF61
>       (halfwidth ideographic full stop).
> 
> We may want to consider adding a mapping rule from those to U+002E in
> the domainpart.

There's a reason IDNA is defined in terms of labels. If we update or
replace RFC 7622, we should do the same.

Peter