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Re: [netmod] definition of "fully expanded YANG"

Michael Rehder <Michael.Rehder@Amdocs.com> Wed, 17 July 2019 13:19 UTC

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From: Michael Rehder <Michael.Rehder@Amdocs.com>
To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
CC: "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: [netmod] definition of "fully expanded YANG"
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Date: Wed, 17 Jul 2019 13:18:57 +0000
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Subject: Re: [netmod] definition of "fully expanded YANG"
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Yes, inlining of everything, including augments. What you'd see in the tree representation.
For example augments makes it particularly impossible for a consumer of the YANG schema to process the schema since the final result.

Some use cases:
- translating to another schema language
- translating to a UI dialog for data entry
- an accurate diff on versions

Model-driven-design means using the "computable specification" for all sorts of things, increasing the ROI of the schema definition.

The diff is a significant issue. As a schema author, I must reliably document all changes.
Without a full expansion, it's easy to not notice that a particular module has changes in its final form.
I don't see how you could verify a semantic version number in a package without this.

> -----Original Message-----
> From: Juergen Schoenwaelder [mailto:j.schoenwaelder@jacobs-university.de]
> Sent: Wednesday, July 17, 2019 9:11 AM
> To: Michael Rehder <Michael.Rehder@Amdocs.com>
> Cc: netmod@ietf.org
> Subject: Re: [netmod] definition of "fully expanded YANG"
> 
> On Wed, Jul 17, 2019 at 01:03:03PM +0000, Michael Rehder wrote:
> 
> > Has there ever been discussion about defining “fully expanded YANG”,
> > that is a YANG module with all internal and external imports resolved?
> 
> I wonder what "all internal and external imports resolved" means here
> - you mean included inline? I doubt this will be tremendously useful nor do I
> know what that will work with augments and the fact that definitions live in
> different namespaces and that for example must and when expressions are
> namespace qualified.
> 
> I believe there are tools that do semantic diffs based on comparing schema
> trees internal to a compiler and that sounds to me more robust than producing
> "fully expanded YANG".
> 
> /js
> 
> --
> Juergen Schoenwaelder           Jacobs University Bremen gGmbH
> Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
> Fax:   +49 421 200 3103
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