Variant subtag request: iso91995

Doug Ewell doug at
Wed Sep 15 16:01:33 CEST 2010

Avram Lyon <ajlyon at ucla dot edu> replied to an apparently private

> 2010/9/15 "Martin J. Dürst" <duerst at>:
>> I think there is always the possibility of defining a variant with
>> syntactically two subtags, i.e. iso9-1995, iso9-1968, ...
> Can this be done without preventing 1995 or 1968 from being used as
> variant subtags in their own right in the future?

Nothing would be prevented.  If it is desirable to restrict, say, '1995'
so that it could only follow 'iso9', we would have to specify "xx-iso9"
as the Prefix for '1995', for every language 'xx' that Avram listed.  We
could not specify just "iso9" because a Prefix for a variant must be a
whole tag.  And in any case, taggers are still free to use variants with
non-recommended prefixes.

I don't have a solution, but I hope we can do better than 'iso91995'.

Doug Ewell | Thornton, Colorado, USA |
RFC 5645, 4645, UTN #14 | ietf-languages @ is dot gd slash 2kf0s ­

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