Proposal to remove Preferred-Value field for region YU in LTRU

[Randy Presuhn]

Hi -

> From: "Mark Davis" <mark at macchiato.com>
> To: "CE Whitehead" <cewcathar at hotmail.com>
> Cc: <ietf-languages at iana.org>
> Sent: Friday, February 27, 2009 9:23 AM
> Subject: Re: Proposal to remove Preferred-Value field for region YU in LTRU
>
> No, we don't. That information is available externally, for those who would
> care. It does not matter for the purposes of BCP 47.

Strongly agreed.  The "tag wisely" concept, especially with respect to
region subtags, requires a mass of knowledge of the language(s)
as well knowing for what purpose the data is being tagged.
It's quite unrealistic to expect this to somehow be encoded
in the registry.  We can try to be helpful in cases of splits
and merges by providing appropriate comments, but the decision
about what subtag to use belongs to the tagger, and cannot
realistically be automated in some cases.

Randy