On Thu, Apr 7, 2016 at 3:45 AM, Juergen Schoenwaelder <
[email protected]> wrote:
> On Thu, Apr 07, 2016 at 08:55:19AM +0000, Scharf, Michael (Nokia - DE)
> wrote:
> > > I come at this from the classification angle, so my interest is if the
> assumption that
> > > a YANG model can only be classified as a network service model XOR a
> network device model
> > > according to the definitions in
> draft-ietf-netmod-yang-model-classification (sections 2.1
> > > and 2.2). Based on this discussion I take it that some models are
> intended to be able to
> > > serve in both roles. And we should make sure that it’s supported in
> our catalog structure.
> >
> > Regarding the XOR assumption for classification:
> >
> > You may also want to think about YANG models that are NEITHER device NOR
> service models. For instance, what about RFC 6991? And I think other, more
> technical models presented this week may fall into a similar category
> ("generic"?).
> >
>
> RFC 6991 is not really defining a data model, while ietf-yang-types
> and ietf-inet-types are both YANG modules they do not define any data
> nodes that can be implemented. Lets look at RFC 6020bis:
>
> o data model: A data model describes how data is represented and
> accessed.
>
> Anyway, the point is that RFC 6991 do not define any data nodes and
> hence nothing that can be accessed. Perhaps it helps to import
> terminology into the model classification document and to be explicit
> that not all YANG modules define YANG data models.
>
>
I brought this issue up for YANG 1.1 but there was no interest
or agreement that there is any problem or confusion.
http://www.netconfcentral.org/modulereport/iana-crypt-hash
Consider iana-crypt-hash that only contains 1 typedef and 3 features
that relate to implementation of that typedef. According to YANG 1.1
and the YANG library, a server implement MUST NOT claim it
implements iana-crypt-hash. Instead the server must say "I import
this module, but implement the features". How can one implement
something that is supposedly only imported? Very confusing.
There is only ONE data model in a YANG implementation,
which is composed of one or more modules.
/js
>
>
Andy
> --
> Juergen Schoenwaelder Jacobs University Bremen gGmbH
> Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany
> Fax: +49 421 200 3103 <http://www.jacobs-university.de/>
>
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