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[idn] Hostname syntax
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"Eric A. Hall" wrote:
> Until the 2-char rule inherited from 952 by 1035 is overthrown (which I
> wish somebody would state one way or the other), it is implicitly upheld.
What 2-character rule? There is nothing in either the 952, 1035, or
1123 syntaxes to prohibit single-character labels.
Extend ABNF with an operator \, so that a string matches A \ B iff it
matches A but not B.
Then the syntax implied by RFC 1123, ignoring the 255-character limit
on hostnames, is:
RFC1123HostName = *(HostLabel ".") TopLevelHostLabel
HostLabel = (LETTER / DIGIT) [61*(LETTER / DIGIT / "-") (LETTER / DIGIT)]
TopLevelHostLabel = HostLabel \ *DIGIT
Does anyone disagree?
- --
David Hopwood <david.hopwood@zetnet.co.uk>
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