[Ltru] Re: Registry change of the day: prefix with more than one subtag

On Mon, Jul 09, 2007 at 10:56:33PM -0700,
 Doug Ewell <dewell@roadrunner.com> wrote 
 a message of 72 lines which said:

> I can't think of a clean way to tell software which variants can be
> used together and which cannot,

I believe that we should handle this case under the general rule
"standards cannot prevent every stupid thing":

"Validity of a tag is not everything. A tag may be valid and
meaningless. This is unavoidable with a generative system like the
language subtag mechanism. So, ar-Cyrl-AQ - Arabic written with the
cyrillic script, as used in Antarctica - is perfectly valid but should
nevertheless be avoided because it has no relationship with the
reality."

There does not seem to be similar text in 4646bis. Do we think it
should be included or is it too paternalistic for readers?

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