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Frank Ellermann wrote:
Julian Mehnle wrote:
IMO the only technical reason for the definition of TLD labels to be
ANY stricter than that for non-TLD labels is to guarantee distinction
from IPv4 addresses. For that, the "not a single character"
restriction is unnecessary.
[...]
Just one more detail (similar to "not only digits") that doesn't _have_
to be codified in the grammar, IMO.
"Not only digits" affects the root servers, I could dig for a draft
discussing this issue. IIRC they even considered to create pseudo TLDs
to reduce the load for this crap.
I do know the technical reason for not allowing only-digits domains.
I just said that such a restriction doesn't have to be codified in the
formal grammar but that a verbal note (like we had before for the
"toplabel" definition) is sufficient.
(BTW, Frank, don't take it personally, but I think your use of the term
"singleton TLD" is inappropriate and confusing.)
Straight from 3066bis, and it wasn't me who proposed this term for a
single <alphanum>. It's also used in Bridge (the card game) terminology.
What do you think it means ?
In maths context, it's a set with exactly one element (but names, including
domain names, aren't sets -- they're permutations).
In DNS context, I'd interpret "singleton domain" as a domain that is the
sole name within its parent domain. Like "a.only-a.com" within
"only-a.com" (unless "a" is misleadingly NOT the only sub-domain, of
course).
But I'm not a native English speaker, perhaps my interpretation of
"singleton" is too strict.
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