[ietf-dkim] Internationalized domain names
dotis at mail-abuse.org
Wed Jul 19 16:08:48 PDT 2006
On Jul 19, 2006, at 10:29 AM, Paul Hoffman wrote:
>> Calling this an ACE label which is identified by the "xn--" prefix
>> may avoid some of the confusion.
>> This could also be written as:
>> Internationalized domain names MUST be converted using the
>> steps in section 4 of [RFC3490] into "ACE" labels using the
>> ToASCII function.
> No, that's wrong: only the labels that have non-LDH characters are
> converted. Section 4 in IDNA covers this correctly.
Good point, but not exactly right either. A term for international
domain names encoded into ACE labels would provide a useful
reference, rather than calling this puny-code. The '_' underscore
character is also not one of the 37 case-insensitive LDH (letter,
digit, or hyphen) characters either, but the intent is not to include
this label within this requirement. While domain name encoding is
specifically mentioned with the i= parameter where there are
essentially no character restrictions for subdomains, this statement
also applies to the d= tag as well.
Internationalized domain names MUST be converted using the
steps in section 4 of [RFC3490] into "ACE" labels when
appropriate by applying the ToASCII function for "stored stings."
This requirement does not apply to the "_domainkey" label.
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