[Standards] IDN Names and NodePrep
chris.mullins at coversant.net
Sat Jun 30 16:57:53 CDT 2007
This is probably a silly question, but it's been giving me a hard time
for a bit now.
Is "!.com" (without the quotes) a valid JID?
The definition of a JID is:
A domain identifier MUST be an "internationalized domain name"
as defined in [IDNA], to which the Nameprep [NAMEPREP]
profile of stringprep [STRINGPREP] can be applied
>From this definition, "!.com" passes all the rules.
None of the prohibited tables list "!" in them anywhere (or " " <space>)
as far as I can tell.
IDNA does talks about LDH characters (which would means a "!" is
invalid), and it talks about them in the context of having a
UseSTD3ASCIIRules flag. I can't determine if I should be using this or
Common sense says "yes" we should require this flag, but the more I read
the spec, the more I think, "no". Specifically the phrase (from RFC
An "internationalized label" is a label to which the ToASCII
operation (see section 4) can be applied without failing
(with the UseSTD3ASCIIRules flag unset).
Can any of the IDNA / Unicode guru's on this list help me answer this?
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