[netmod] Re: Defining groupings after the fact? draft-jouqui-netmod-yang-full-include and the reuse of definitions

[William Lupton <[e-mail]>]

Alex,

On Wed, 31 Jul 2024 at 23:37, Alexander L Clemm <ludwig=
[e-mail]> wrote:

> ...
> >> As a thought, it might be useful to introduce a construct that will
> allow to define
> >> a _grouping_ after-the-fact, for later reuse.  I.e., allow groupings to
> be defined
> >> in a way that the new grouping embeds an existing definition, then
> simply make
> >> use of that grouping.  That would seem perhaps cleanest, able to
> address many
> >> of the use cases and have the additional advantage that the semantics
> here will
> >> be very clear since part of the exising YANG framework.
> > There is still the augment issue from above, we have it in
> draft-ietf-opsawg-collected-data-manifest when reusing ietf-yang-push which
> augments ietf-subscribed-notifications. All these augments have to be
> rewritten with paths corresponding to the new location of the uses.
> <AC> I don't think that would be an issue, actually.  Just declare
> modular, fine grained groupings and use those.  Of course, this is
> somewhat a speculative discussion as YANG is what it is and does not
> support this today.


<WL>
What does "this" refer to here? YANG _does_ "allow groupings to be defined
in a way that the new grouping embeds an existing definition", doesn't it?

https://datatracker.ietf.org/doc/html/rfc7950#section-11 : Any set of data
definition nodes may be replaced with another set of syntactically and
semantically equivalent nodes. For example, a set of leafs may be replaced
by a "uses" statement of a grouping with the same leafs.
</WL>

Cheeers,
William