Lookup for reserved LDH labels
sanz at denic.de
Wed Nov 7 10:55:56 CET 2012
> mark is correct.
that is not incompatible with my statement. He said
"the intention is to permanently reserve anything of the form "xy--..."
(where x and y are in [a-z0-9]"
and I agree with that.
> "putative" means that the "--" appears in 3rd and 4th position of
> the string - it means the label purports to be the prefix of a U-label.
The definition of "putative U-Label" (a.k.a. "unvalidated" or "apparent"
U-Labels) is found in the last paragraph of Section 18.104.22.168:
"unvalidated U-labels are simply non-ASCII labels that may or may not meet
the requirements for U-labels."
Thus "ad--acta.de" (plain ASCII) is not a putative U-Label and must not be
subject of any of the validation bullets listed in the lookup Section 5.4.
More information about the Idna-update