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[Ltru] Re: RFC 4646 production "grandfathered" considered harmful



On Sun, Sep 17, 2006 at 02:19:12AM -0400,
 John Cowan <cowan at ccil.org> wrote 
 a message of 58 lines which said:

> 2) Add an explicit "irregular" production in place of the "grandfathered"
> production which explicitly enumerates the 17 irregular grandfathered
> tags, thus:

+1

(When I wrote a parser, I suppressed that production from my grammar,
replacing it with a list of grandfathered tags, extracted from the
registry. I prefer when the parser's gramamr is as close as possible
from the RFC's gramamr.)

> It is safe to enumerate this list explicitly, as it can neither grow
> nor shrink.

Yes, that's the big reason for me.


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