On Thu, Oct 02, 2008 at 04:23:22PM +0200,
Mark Davis <mark at macchiato.com> wrote
a message of 107 lines which said:
> <t>Four digit subtags are reserved for indicating a year. Their
> meaning is in reference to some significant specification or other
> work associated with that year. It may have multiple prefixes: the
> particular specification for a given prefix MUST be clearly indicated
> in one of the Descriptions.</t>
Strongly -1 for me. While it may be a good idea to avoid registrations
of 4-digits subtags, because of the risk of collision and the risk
that the first one to register 1901 will deprive the others, I do not
think it should be written down in the RFC. 4646bis is already too
long and too detailed on some points.
A related reason for suppressing this paragraph is because 4-digits
subtags are just a subset of "generic" subtags ("northern" or
"academy" being another common examples) and we should not legislate
for just a part of the generic subtags.
Such restrictions should belong to an "ietf-languages policy" (which,
as John Cowan is fond of mentioning, already exists, even if it is
currently unwritten).
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