[Ltru] RE: Remove extlang from ABNF? (Was: summary of recommendations coming out of this week's teleconf

Peter Constable <petercon@microsoft.com> Mon, 03 December 2007 21:59 UTC

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From: Peter Constable <petercon@microsoft.com>
To: LTRU Working Group <ltru@ietf.org>
Date: Mon, 3 Dec 2007 13:59:40 -0800
Thread-Topic: Remove extlang from ABNF? (Was: summary of recommendations coming out of this week's teleconf
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Subject: [Ltru] RE: Remove extlang from ABNF? (Was: summary of recommendations coming out of this week's teleconf
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> From: Stephane Bortzmeyer [mailto:bortzmeyer@nic.fr]


> > remove extlang from the ABNF.
>
> Warning, it means that tags which were well-formed in RFC 4646 (but
> not valid since no extlang was registered) won't be well-formed
> anymore. Isn't a violation of the stability principle? (Yes, the
> "extlang" production in RFC 4646 was marked as "reserved for future
> use" but it was legal nevertheless.)

Correct. Since there have never been registered extlang subtags, there might be parsers that allow for it but there should not be any tags that include them. If some such tags are out there in the wild, they would be well-formed but not valid in 4646, and neither well-formed nor valid in 4646bis (under this proposal).



Peter


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