On Thu, Jul 30, 2015 at 10:58:35AM -0700, Andy Bierman wrote: > On Thu, Jul 30, 2015 at 10:41 AM, Martin Bjorklund <m...@tail-f.com> wrote: > > > Andy Bierman <a...@yumaworks.com> wrote: > > > On Wed, Jul 29, 2015 at 10:51 AM, Martin Bjorklund <m...@tail-f.com> > > wrote: > > > > > > > Andy Bierman <a...@yumaworks.com> wrote: > > > > > Hi, > > > > > > > > > > I understand the intent is that an implementation of NACM > > > > > has to understand these NACM extensions. I agree with Lada > > > > > that the YANG text about MAY ignore extensions casts doubt whether > > > > > this sort of NACM rule is enforceable or specified correctly. > > > > > > > > So do you agree that it would be a good idea to clarify this > > > > according to Juergen's suggestion? > > > > > > > > > > > > > > > Not really. > > > Pretending the extension is just another description-stmt > > > does not really fix anything. > > > > > > A real YANG statement like config-stmt or a new statement > > > called ephemeral-stmt can be modified with refine-stmt > > > or deviate-stmt. This can never happen for > > > an external statement. > > > > There are two separate issues here: > > > > 1) It seems we are in agreement that if a model uses an extension > > statement, it is normative (like ietf-system's usage of nacm:*). > > > > Should we somehow clarify this in 6020bis? > > > > > No -- I agree that was the intent, but it is not achievable > because tools MAY ignore extensions. >
Why do we keep on confusing what a statement in a module means and what a tool is required to do? If I decorate a definition with nacm:default-deny-write, then I assume that an implementation will implement the semantics associated with nacm:default-deny-write. If this would not be the case, then why did we define this at all? It does not matter whether a tool knows how to implement nacm:default-deny-write or whether this must be coded by a human. Sorry for repeating myself. /js -- 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/> _______________________________________________ netmod mailing list netmod@ietf.org https://www.ietf.org/mailman/listinfo/netmod
