[Idngwg] Non-IDN-labels with hyphen in position 3 and 4

[Mats Dufberg]

On the meeting today we had a discussion on the following text in the upcoming Guidlines:

<quote>
//current recommendation 8: No label containing hyphens in the third and fourth positions will be registered unless it is a valid A-label, with reservation for transitional action in accordance with the preceding Guideline. Hyphens in these positions are explicitly reserved to indicate encoding schemes, of which IDNA is only one instantiation. These guidelines are not intended to assist with any other instantiations.
</quote>

The questions was if the IDNA standards included any restriction against non-A-labels with hyphen in position 3 and 4, e.g. xx--mytest. In RFC 5890, section 2.3 it says

<quote>
   Some strings that are prefixed with "xn--" to form labels may not be
   the output of the Punycode algorithm, may fail the other tests
   outlined below, or may violate other IDNA restrictions and thus are
   also not valid IDNA labels. (...)

   Labels within the class of R-LDH labels that are not prefixed with
   "xn--" are also not valid IDNA labels. (...)

   (...) For
   IDNA-aware systems, the valid label types are: A-labels, U-labels,
   and NR-LDH labels.
</quote>


Yours,
Mats

--
Mats Dufberg
DNS Specialist, IIS
Mobile: +46 73 065 3899
https://www.iis.se/en/<http://www.iis.se/en>

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