> On 03 Aug 2015, at 16:41, Andy Bierman <a...@yumaworks.com> wrote: > > > > On Mon, Aug 3, 2015 at 2:25 AM, Juergen Schoenwaelder > <j.schoenwael...@jacobs-university.de> wrote: > On Mon, Aug 03, 2015 at 11:06:41AM +0200, Jernej Tuljak wrote: > > Juergen Schoenwaelder je 3.8.2015 ob 10:18 napisal: > > >Any description statement in principle can do this. We trust that sane > > >data model writers won't do bad things. And if they do, we hope that > > >people will not implement and deploy bad things. > > > > Why not simply make this impossible by ensuring that description > > statements cannot change what has already been agreed upon in RFC6020 > > (aka YANG semantics)? I would have no problem with descriptions being > > normative, if this would be the case. > > You need to define way more clearly what 'YANG semantics' means. > > > > Agreed. The description-stmt is normative. > It defines implementation requirements for a data node. > It is not used to override other YANG statements. > However, if the description says "child foo must be > greater than the value of bar" that is just as normative > as a must-stmt that says the same thing. > > > > >I continue to see extension statements as reusable and (in principle) > > >machine readable fragments of description statements. From this > > >perspective, it seems odd to make a difference between extensions and > > >description statements. > > > > I still disagree that description statements should be more powerful > > than any other YANG statement. > > What does 'powerful' mean? Time that someone writes concrete text so > we can have a more constructive discussion. > > > A YANG description-stmt cannot override the syntax and semantics of other YANG > statements. But is is mandatory and it is normative.
It’s not only about overriding. For example, it wouldn’t be good to introduce a new data node type though an extension. Lada > > > > > /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/> > -- Ladislav Lhotka, CZ.NIC Labs PGP Key ID: E74E8C0C _______________________________________________ netmod mailing list netmod@ietf.org https://www.ietf.org/mailman/listinfo/netmod
