Re: [Rtg-yang-coord] Operational State Modeling

Agree that standards need to be stable, and can be refactored if necessary.

From the perspective of these models, implementations need to put them together in a compatible way. If it is necessary to change them, they need to be changed coordinately.

- Xufeng

> -----Original Message-----
> From: Thomas D. Nadeau [mailto:tnadeau@lucidvision.com]
> Sent: Wednesday, May 13, 2015 9:14 AM
> To: Juergen Schoenwaelder
> Cc: Anees Shaikh; Rtg-yang-coord@ietf.org; Acee Lindem (acee); Xufeng Liu
> Subject: Re: [Rtg-yang-coord] Operational State Modeling
> 
> 
> 	Speaking as an individual, while what Juergen says is true, that does not
> mean that existing models can never be refactored.
> 
> 	—Tom
> 
> 
> > On May 13, 2015:6:35 AM, at 6:35 AM, Juergen Schoenwaelder
> <j.schoenwaelder@jacobs-university.de> wrote:
> >
> > On Wed, May 13, 2015 at 12:51:41AM -0700, Anees Shaikh wrote:
> >>
> >> Regarding compatibility with existing models, I really don't agree at
> >> all that the existing RFC models should constrain what we do when
> >> trying to meet the requirements of people trying to build real systems that
> use YANG
> >> models.    With all respect to the authors of those few models (which we
> >> leverage considerably in our models), YANG models are software code,
> >> and should be treated as such IMO.  We don't say that software is
> >> "done" and can't change -- it evolves and improves over time,
> >> sometimes in non-backward-compatible ways.  And we don't issue a
> >> final version of software without considerable experience using and testing it
> in production.
> >>
> >
> > Standards and software are not the same. The value of standards is
> > that they provide a stable basis. In other words, the value of
> > standards is that they do not change every other day. Yes, you can
> > rewrite standardized data models but the cost of doing so is high and
> > hence the benefit of rewriting something must be high. I do not see
> > this here - not even remotely.
> >
> > /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/>
> >
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