On 23/06/2022 22:08, Ira McDonald wrote:
Hi Carsten,
I take your point about copying from a given RFC.
But the history of IETF Language Tags is RFC 1766 (1995), RFC 3066 (2001),
RFC 4646 (2006), and RFC 5646 (2009). It's a long time since 2009 and, as
Martin noted, there have been a variety of proposals for updating language
tags in the past 13 years, so it's reasonably likely that there will be a
newer
version at some point. And since language tags are now quite structured,
the chance of not needing syntax changes is fairly low. This draft RFC from
CORE wouldn't catch up quickly, presumably.
Probably a left field comment.
I had not heard of, or forgotten about, language tags until the IESG
review of draft-ietf-i2nsf-nsf-facing-interface-dm drew a DISCUSS from
Francesca because the 26 YANG string that were meant to be human
readible had no language tags. She pointed to RFC2277 while saying that
RFC5646 should be a Normative Reference.
The I-D was revised to include a YANG leaf 'language' with a horrendous
YANG pattern spanning 25 lines.
Two consequences. The pattern, doubtless a gross simplification of what
it might have been, was wrong and was revised - I have not looked to see
if it makes sense now but then I did not spot the error in the first
place - so I have the sense that, like trying to specify a pattern for
IPv6 address, language tags are easy to get wrong. Second there is now
a pattern of Francesca throwing DISCUSS at other similar I-D so language
tags, and their modelling in YANG, could get more attention (at least
while Francesca is on the IESG:-) her comments could have been made
about any number of earlier YANG RFC). The pattern in the I2NSF I-D
cannot be imported into another YANG module, rather each YANG module
that draws a DISCUSS will contain a fresh copy. If ideas evolve, then
there are likely to be many disparate copies.
Tom Petch
Cheers,
- Ira
*Ira McDonald (Musician / Software Architect)*
On Thu, Jun 23, 2022 at 2:34 PM Carsten Bormann <cabo@xxxxxxx> wrote:
On 2022-06-23, at 13:13, Ira McDonald <blueroofmusic@xxxxxxxxx> wrote:
Hi Carsten,
OK - you need to get this CORE document published quickly.
Thank you.
But I still think that detailed CDDL would be a long-term mistake, for
the reason
that Martin cited - i.e., copying/transforming grammars among RFCs is
fragile.
Well, the RFC is immutable, so the act of making a copy cannot by itself
be fragile.
What got us to now propose blunting that grammar is the strong impression
that there may be less consensus about the grammar defined by RFC 5646 than
we thought. So it seems the grammar in RFC 5646 is fragile, not the act of
copying it out...
https://github.com/core-wg/core-problem-details/pull/40/commits/bbe72e2
(I’m making a point about copying here as I believe copying out snippets
of CDDL from RFCs and other specifications will be a significant part of
CDDL 2.0.)
Grüße, Carsten
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