[netmod] Re: 'mandatory' evaluated against obsolete nodes?

["Jason Sterne (Nokia)" <[e-mail]>]

Hi Michal,

I see some hints about different obsolete node treatment in a transition manual referenced by the release notes for Version 4.2.2 of libyang:
libyang: Transition Manual (3.x -> 4.0)<https://netopeer.liberouter.org/doc/libyang/master/html/transition3_4.html>

I’m just checking if that address the issue in this thread (of ignoring mandatory statements for nodes that are obsolete)?

Jason

From: Mahesh Jethanandani <[e-mail]>
Sent: Monday, June 2, 2025 9:23 AM
To: Robert Wilton <rwilton=[e-mail]>
Cc: Michal Vasko <mvasko=[e-mail]>; [e-mail]
Subject: [netmod] Re: 'mandatory' evaluated against obsolete nodes?


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I note that this issue is documented here: https://github.com/netmod-wg/yang-next/issues/66


On Jun 2, 2025, at 5:07 AM, Rob Wilton (rwilton) <rwilton=[e-mail]<mailto:rwilton=[e-mail]>> wrote:

Hi Michal,

Yes, I think that the default should be to assume the deprecated nodes exist and obsolete nodes don’t perhaps with options to override the default behaviour.

Kind regards,
Rob


From: Michal Vasko <mvasko=[e-mail]<mailto:mvasko=[e-mail]>>
Date: Monday, 2 June 2025 at 11:45
To: [e-mail]<mailto:[e-mail]> <[e-mail]<mailto:[e-mail]>>
Subject: [netmod] Re: 'mandatory' evaluated against obsolete nodes?
So, I suppose libyang should be changed so that it does not validate obsolete nodes. It should also treat these nodes as non-existing, without the option of creating them? Or perhaps this should be the default behavior with an option to parse/create and validate these nodes (current behavior)?
Regards,
Michal
On 2. 6. 2025 11:09, Rob Wilton (rwilton) wrote:
Andy’s interpretation is also consistent with https://datatracker.ietf.org/doc/html/draft-ietf-netmod-yang-module-versioning-13#name-reporting-how-deprecated-an, although that is done as flags advertised by the server rather than updating the YANG language.

Kind regards,
Rob


From: Reshad Rahman <reshad=[e-mail]><mailto:reshad=[e-mail]>
Date: Thursday, 29 May 2025 at 22:03
To: Andy Bierman <[e-mail]><mailto:[e-mail]>, Kent Watsen <[e-mail]><mailto:[e-mail]>
Cc: Jason Sterne (Nokia) <jason.sterne=[e-mail]><mailto:jason.sterne=[e-mail]>, [e-mail]<mailto:[e-mail]><[e-mail]><mailto:[e-mail]>
Subject: [netmod] Re: 'mandatory' evaluated against obsolete nodes?
+10.

On Thursday, May 29, 2025 at 03:20:44 PM EDT, Kent Watsen <[e-mail]><mailto:[e-mail]> wrote:




On May 29, 2025, at 11:01 AM, Andy Bierman <[e-mail]><mailto:[e-mail]> wrote:

We implement what makes sense.

- deprecated means MUST implement (same as current but with a 'going away' warning)
-  obsolete nodes are removed from the schema tree by the server so no validation is done on them and they are never implemented


This behavior sounds proper.

Kent // contributor

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Mahesh Jethanandani
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