[Ltru] Re: Remove extlang from ABNF?

Martin Duerst wrote:

> My understanding is that if we leave the production in the ABNF,
> such tags would still be well-formed. I don't think we can have
> it both ways. The tags would be well-formed but obsolete.

The logic of <grandfathered> regular vs. irregular tags is affected
by <obs-extlang>.  If <obs-extlang> exists, then zh-min-nan is
regular, otherwise it's irregular.  I think.  I'm not going to
explain this to anybody who asks, I'd need a flow chart to grok it.

> I think we are extremely clear on the fact that we don't want 
> anybody to generate tags with extlangs (except for a few pre-
> registered ones (*)).

Did you forget a footnote (*) in your article ?  I'm not sure
that say zh-min-nan counts as using "pre-registered extlangs",
because min and nan were never registered as extlangs with
prefixes zh and min resp., RFC 4646 doesn't permit this.  It
only reserved the possibility.

OTOH zh-min-nan matches <language> + <obs-extlang>, messy... :-(

 Frank

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