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Re: [netmod] YANG next

Robert Varga <nite@hq.sk> Wed, 24 July 2019 14:31 UTC

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To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>, Andy Bierman <andy@yumaworks.com>, NETMOD WG <netmod@ietf.org>
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From: Robert Varga <nite@hq.sk>
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Subject: Re: [netmod] YANG next
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On 24/07/2019 15:51, Ladislav Lhotka wrote:
> Despite the fact that YANG 1.1 and NMDA are undoubtedly improvements, users may get frustrated if lazy authors (including myself) don't update their tools in a timely manner.

Well, honestly, YANG 1.1, while compatible when viewed from the
perspective of a client processing XML, has a different metamodel than
YANG 1.0.

One example for all: YANG 1.0 metamodel did not require multiple
inheritence anywhere, whereas YANG 1.1 requires it to deal with 'base'
being '0..n' instead of '0..1'.

While it is a relatively simple change on the surface, making it happen
in a software ecosystem (with API stability guarantees, release cycles,
etc.) does frustrate users even in presence of non-lazy authors (who
also get frustrated)...

Regards,
Robert

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