Re: [netmod] yang-data-ext issues

Martin Bjorklund <mbj@tail-f.com> Tue, 24 April 2018 14:36 UTC

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Date: Tue, 24 Apr 2018 16:36:01 +0200 (CEST)
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To: lhotka@nic.cz
Cc: j.schoenwaelder@jacobs-university.de, netmod@ietf.org
From: Martin Bjorklund <mbj@tail-f.com>
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Subject: Re: [netmod] yang-data-ext issues
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Ladislav Lhotka <lhotka@nic.cz>; wrote:
> Martin Bjorklund <mbj@tail-f.com>; writes:
> 
> > Hi,
> >
> > I am not sure what this statement tells us re. the issue in this email
> > thread.
> 
> It tells us that, in my view, the approach taken in this document is a
> bad idea.

Do you mean that the WG shoud drop this document?  And people that
need yang-data should continue to use the version in 8040?  Or that
people that need yang-data do not have a valid use case and they
should do something else?


/martin



> 
> Lada
> 
> >
> >
> > /martin
> >
> >
> > Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>; wrote:
> >> On Sun, Apr 22, 2018 at 02:56:51PM +0200, Ladislav Lhotka wrote:
> >> 
> >> > I am much more concerned with some of the post-1.1 features, also
> >> > because YANG is now being updated in several directions without a
> >> > clear vision. And another big problem is that YANG extensions are
> >> > used for these changes, so we will probably end up with several
> >> > different versions of YANG, although formally everything will be
> >> > 1.1.
> >> 
> >> I tend to agree. Ideally, we would carefully remove things from YANG
> >> that did not meet the cost/benefit target (e.g., submodules),
> >> reorganize definitions whenever possible (some NETCONF specific stuff
> >> in the YANG specification should not be there, XML encoding may be
> >> factored out) and incorporate new features (like yang-data) after we
> >> have sufficient _experience_ to know that such new features will be
> >> useful (which seems to be the case for yang-data).
> >> 
> >> Yes, such iterations likely take 2 years at IETF speed but this kind
> >> of maintenance cost/effort is likely the price to be paied for
> >> something that is being used at a larger scale.
> >> 
> >> Some people will say that the cost of a new language version is high.
> >> (Well, when we did 1.1, some people said it will never be deployed.)
> >> Anyway, not bumping the YANG version number but having instead several
> >> (optional) language extensions is just hiding the version number
> >> change under the carpet.
> >> 
> >> /js
> >> 
> >> -- 
> >> Juergen Schoenwaelder           Jacobs University Bremen gGmbH
> >> Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
> >> Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>
> >> 
> >> _______________________________________________
> >> netmod mailing list
> >> netmod@ietf.org
> >> https://www.ietf.org/mailman/listinfo/netmod
> >> 
> 
> -- 
> Ladislav Lhotka
> Head, CZ.NIC Labs
> PGP Key ID: 0xB8F92B08A9F76C67
>