Subject: [Ltru] Re: Test suite for language tags? (Frank Ellermann)

From: "Doug Ewell" <[email-masked]>
Date: Sun, 3 Sep 2006 13:08:28 -0700

Frank Ellermann <nobody at xyzzy dot claranet dot de> wrote:

>> additions are of course very welcome
>
>  For well-formed:
>
> abcd-Latn
> AaBbCcDd-x-y-any-x
>
>  For broken:
>
> abcd-efg
> aabbccddE

Thanks for bringing up the abcd-efg case.  I'd forgotten that extlangs 
can only follow a 2- or 3-letter primary language subtag, not only 
semantically (because of their genesis) but also syntactically:

language      = (2*3ALPHA [ extlang ]) ; shortest ISO 639 code
              / 4ALPHA                 ; reserved for future use
              / 5*8ALPHA               ; registered language subtag

extlang       = *3("-" 3ALPHA)         ; reserved for future use

--
Doug Ewell
Fullerton, California, USA
http://users.adelphia.net/~dewell/
Editor, draft-ietf-ltru-initial

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