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

Mahesh Jethanandani <mjethanandani@gmail.com> Mon, 02 June 2025 13:23 UTC

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From: Mahesh Jethanandani <mjethanandani@gmail.com>
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Date: Mon, 02 Jun 2025 06:23:02 -0700
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To: Robert Wilton <rwilton=40cisco.com@dmarc.ietf.org>
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CC: Michal Vasko <mvasko=40cesnet.cz@dmarc.ietf.org>, "netmod@ietf.org" <netmod@ietf.org>
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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=40cisco.com@dmarc.ietf.org> 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=40cesnet.cz@dmarc.ietf.org>
> Date: Monday, 2 June 2025 at 11:45
> To: netmod@ietf.org <netmod@ietf.org>
> 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 <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=40yahoo.com@dmarc.ietf.org> <mailto:reshad=40yahoo.com@dmarc.ietf.org>
> Date: Thursday, 29 May 2025 at 22:03
> To: Andy Bierman <andy@yumaworks.com> <mailto:andy@yumaworks.com>, Kent Watsen <kent+ietf@watsen.net> <mailto:kent+ietf@watsen.net>
> Cc: Jason Sterne (Nokia) <jason.sterne=40nokia.com@dmarc.ietf.org> <mailto:jason.sterne=40nokia.com@dmarc.ietf.org>, netmod@ietf.org <mailto:netmod@ietf.org><netmod@ietf.org> <mailto:netmod@ietf.org>
> Subject: [netmod] Re: 'mandatory' evaluated against obsolete nodes?
> 
> +10.
>  
> On Thursday, May 29, 2025 at 03:20:44 PM EDT, Kent Watsen <kent+ietf@watsen.net> <mailto:kent+ietf@watsen.net> wrote: 
>  
>  
>  
>  
> 
> On May 29, 2025, at 11:01 AM, Andy Bierman <andy@yumaworks.com> <mailto:andy@yumaworks.com> 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
mjethanandani@gmail.com

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