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Re: [netmod] YANG Versioning Weekly Call Minutes - 2021-06-08

Kent Watsen <kent+ietf@watsen.net> Mon, 14 June 2021 17:16 UTC

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From: Kent Watsen <kent+ietf@watsen.net>
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Date: Mon, 14 Jun 2021 17:16:37 +0000
Cc: "Sterne, Jason (Nokia - CA/Ottawa)" <jason.sterne@nokia.com>, "netmod@ietf.org" <netmod@ietf.org>
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Subject: Re: [netmod] YANG Versioning Weekly Call Minutes - 2021-06-08
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> I meant the current work is using extensions instead of new language statements.
> Not that the yang-version will never be changed in the future.

Ah, okay.


> It is not a matter of "when" if new functionality is added via extensions.
> In theory the WG could add new functionality to YANG 1.1 this way for years.
> In practice it might be difficult to achieve widespread interoperability if nobody
> agrees what "YANG next"  actually contains. Also, YANG 1.1 clearly says a tool MAY
> skip over and ignore ANY external statement, so it is problematic to use extension-stmt
> as if it was defining real statements. It is better to have a tool clearly fail
> with an "unsupported YANG version" error than it is to silently ignore external statements.

Agreed.


K.

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