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

"Rob Wilton (rwilton)" <rwilton@cisco.com> Fri, 19 July 2019 10:36 UTC

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From: "Rob Wilton (rwilton)" <rwilton@cisco.com>
To: Michael Rehder <Michael.Rehder@Amdocs.com>, "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: definition of "fully expanded YANG"
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Date: Fri, 19 Jul 2019 10:36:00 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/OCru3pygI4l9xs9pPrKOuT1TgEE>
Subject: Re: [netmod] definition of "fully expanded YANG"
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Hi Michael,

I don’t know about “fully expanded YANG”, but some of the work by the YANG versioning design team might be of interest to you:

draft-verdt-netmod-yang-solutions-01<https://datatracker.ietf.org/doc/draft-verdt-netmod-yang-solutions/> gives an overview of the solution space.
draft-rwilton-netmod-yang-packages-01<https://datatracker.ietf.org/doc/draft-rwilton-netmod-yang-packages/> defines versioned packages (although it needs some updating to accommodate the changes that happened to draft-verdt-netmod-yang-module-versioning-00<https://datatracker.ietf.org/doc/draft-verdt-netmod-yang-module-versioning/>).  A YANG package, if all dependencies are resolved, can be used to define a complete YANG schema (i.e. with module import/include dependencies resolved).  From a definition POV, this might be the “fully expanded YANG” that you are looking for.
However, as others are pointed out, it is effectively tooling that takes a list of YANG modules (perhaps from YANG library, or a YANG package, or other source) and internally constructs a complete schema with dependencies resolved, deviations applied, features handled appropriately.
Thanks,
Rob


From: netmod <netmod-bounces@ietf.org> On Behalf Of Michael Rehder
Sent: 17 July 2019 14:03
To: netmod@ietf.org
Subject: [netmod] definition of "fully expanded YANG"

Has there ever been discussion about defining “fully expanded YANG”, that is a YANG module with all internal and external imports resolved?
This has several uses:
- Base for workable DIFF between versions so one can see all impacts of changes
   I see this as a pretty important part of semantic version management – if you can’t see the net result of changes in a properly modular YANG package, how can you be sure of the version meaning?
- Base for translation/processing of the schema
  There are all sorts other materials one can generate from a YANG (or a fully expanded YIN). If not expanded then this processing is very difficult.

Thanks
Mike
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