Re: [Ltru] RE: ISO 639-2 decision: "mis"

Hi -

As a technical contributor...

> From: "Peter Constable" <petercon@microsoft.com>
> To: "LTRU Working Group" <ltru@ietf.org>
> Sent: Friday, June 15, 2007 3:33 PM
> Subject: RE: [Ltru] RE: ISO 639-2 decision: "mis"
...
> The issue here is evaluating "languages for which tags already exist". 
> You're assuming that every application of BCP 47 must determine that
> based on the complete inventory of the LSTR.

Yes.  If an application lacks the knowledge to make that determination, 
"und" would be the correct choice.

> I'm assuming that a higher-level protocol can restrict the contents of the
> LSTR it permits

As such, it would no longer support BCP 47.
At a minimum, I would argue that a protocol that claims to support BCP 47
must be able to carry all valid tags, and should probably be able to carry
all well-formed tags.  Anything less is merely "based on" BCP 47.

> and that it can also determine the extension of 'mis' on the basis of its
> restricted set.

This is simply not interoperable, as you've already explained.

> I see these as two options we can permit; I don't see one of these
> excluded a priori. It's a choice we should discuss and probably clarify
> in documenting 'mis' (unless we decide to deprecate it).

If someone decides a subset of BCP 47 is appropriate to their needs,
that is fine, just as long as they don't claim to sully support BCP 47.
Taken to absurdity, if my protocol offers a choice limited to "en" and "mis", 
should I be able to claim to support BCP 47?  In any case, I'd really hate
 to have this WG go down the path of defining standardized
"profiles" of BCP 47 unless there were a *huge* benefit to doing so.

Just like the "adapted subset" of ASN.1 used in SMI MIB modules, at
some point one has to admit that the subsetting and adaptation can result
in a quite different beast from what one might have started with.

Randy

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