A-label definition

[Mark Andrews]

> But, FWIW, my conclusions from my reasoning about this and the
> assumption that IDN TLDs are either a good idea or inevitable
> are that:
> 
> 	* We should continue to restrict ASCII TLD strings (a
> 	subset of "LDH labels" in IDNA2008-speak) to
> 	alphabetic-only... no digits or hyphens at all.
> 	
> 	* We should apply the same rules to U-labels (native
> 	character string forms) for TLDs, i.e., no digits, no
> 	punctuation, and, preferably, at least two or three
> 	characters (in the "print position" sense of "character"
> 	long, not dependent on however Unicode coding happens to
> 	work) long.
> 	
> 	* We should permit whatever A-labels fall out from the
> 	above.  I.e., A-labels contain hyphens by definition and
> 	often contain digits as a consequence of the coding.
> 
> But that is just the conclusion I get to by applying my
> conclusions as postulates.  If I do, the above rules more or
> less fall out.  If one starts with different postulates, one
> ends up with different rules.

	I'm happy with that as a outcome.
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org