Re: [netmod] Does defining a feature require the module be implemented?

On Fri, May 13, 2022 at 8:49 AM Robert Varga <nite@hq.sk> wrote:

> On 13/05/2022 17:03, Kent Watsen wrote:
> > True, the current YANG Library structure allows features to be declared
> > only for implemented modules, but I'm unsure how intentional that was.
> >
> > We always talk about how a module needs to be "implemented" in order for
> > its Identities to be defined, but we don't ever talk about the same
> > being true for Features.
> >
> > It seems that, if this is the case, there should be a note somewhere
> > about features used in "grouping" statements and hence the
> > exporting-module must be "implemented" for the grouping to be used as
> > intended.
> >
> > These sections from RFC 8407 don't say anything about it:
> >
> >   * 4.13. Reusable Groupings
> >     <https://datatracker.ietf.org/doc/html/rfc8407#section-4.13>
> >   * 4.17.  Feature Definitions
> >     <https://datatracker.ietf.org/doc/html/rfc8407#section-4.17>
>
> Right, I think we need to first clarify what RFC8525's:
>
> >            "An entry in this list indicates that the server imports
> >             reusable definitions from the specified revision of the
> >             module but does not implement any protocol-accessible
> >             objects from this revision.
>
> "reusable definition" seems to be an under-defined term. I think the
> intent is to cover not only groupings, but also typedefs and extensions.
>
>

I thought this issue was obvious and already settled with the
iana-crypt-hash module.
There are features related to the server implementation of data nodes
that use the crypt-hash typedef.

We list iana-crypt-hash (or any module that has features) in the
implemented modules.
The client needs to know this info and that is the only way to do it.

I think these should also include identities and features -- but that
> opens up quite a can of worms in terms of what a 'supported feature' is:
> - is it tied to a particular revision or does it apply to all revisions?
> - is it a property of imported or (ultimante) importing module?
>
> Regards,
> Robert
>

Andy

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