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Re: [netmod] json empty leaf encoding strangeness [Re: WG Last Call for draft-ietf-netmod-yang-json-04 (until 2015-06-29)]

Carsten Bormann <cabo@tzi.org> Sat, 18 December 2021 12:59 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Date: Sat, 18 Dec 2021 13:59:13 +0100
Cc: Christian Hopps <chopps@chopps.org>, "netmod@ietf.org" <netmod@ietf.org>, Ladislav Lhotka <lhotka@nic.cz>
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To: Eliot Lear <lear@lear.ch>
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Subject: Re: [netmod] json empty leaf encoding strangeness [Re: WG Last Call for draft-ietf-netmod-yang-json-04 (until 2015-06-29)]
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On 2021-12-18, at 09:20, Eliot Lear <lear@lear.ch> wrote:
> 
> Still it seems like the right thing to do, in order to fall into line with the target language spec.

But that’s not what YANG was designed for.
YANG is a data modeling language, which incidentally has a couple of representation formats (YANG-XML, YANG-JSON, YANG-CBOR).
There is no intention for the YANG generic data model (the set of all data models YANG can express) to cover the generic data model of the representation format.

While RFC 8791 (and before it RFC 8040) extended YANG to be able to describe data in flight, there is no intention that YANG can be used to describe the entire expressibility of the representation format.  We have Relax-NG, CDDL, and a few other modeling approaches if we need that.

Grüße, Carsten

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