Re: [netmod] Next steps for draft-ietf-netmod-rfc8407bis

+ In section 4.2 about choice of prefixes, it is said that "Prefix values SHOULD be short but are also likely to be unique." I used to say the same thing. In recent years, however, I have started to stress the importance of uniqueness much more. I'd say something like "Prefix values SHOULD be selected carefully to be unique, and ideally not too long."

[Qin Wu] Fair statement, there is tradeoff between uniqueness of the prefix and prefix length. Sometimes these two factor contradict to each other.
The reason for my change is I have met several engineers who have been deeply confused (to the point of costing real money) when the same prefix has shown up in multiple places. It's just an unnecessary part of the learning curve associated with YANG.

In fact, I have started to recommend people to set the prefix to equal the module name. This also solves another problem, which is that the "prefixes" you see in RESTCONF are module names, and the confusion of what to use where is sometimes suffocating. I understand if many think I'm going overboard here, but when we pretend that modules don't have prefixes, only module names, there is a lot less friction in learning the ropes.

[Qin Wu]:There are two challenges I see here:

a.      sometimes the module name length is too long, which will make prefix long as well.

b.      Prefix definition rule for JSON is different from Prefix definition rule for XML, see section 5 of RFC7951:

o  namespace-qualified - the data node identifier is prefixed with

the name of the module in which the data node is defined,

separated from the data node identifier by the colon character
(":").
I remember there is on relevant discussion on mailing list:
https://mailarchive.ietf.org/arch/msg/netmod/DmvrWxlm3RGgTnPGPiE2hM_TpR8/

+ In section 4.11.5 regarding booleans, it is said that booleans can take values true and false. This is true in mathematics :-) but in YANG a boolean leaf can additionally take the "value" of "not set". Actually, "not set" is a possibility for leafs in general, unless it is declared mandatory true, or has a default. In my experience, one of the most common YANG modeling issues is when people model a leaf foo, which isn't mandatory, has no default and the description statement does not say what happens if the leaf is not set. In many cases, there is a sort of natural meaning, but with booleans leafs in particular, the absence of the leaf is typically highly ambiguous. I think this hole merits a recommendation clause in the I-D.

[Qin Wu] Interesting, it seems you are talking about Qutrit Entanglement in quantum communication. Yes, I agree this worth adding guidance. What is your recommendation? Allow three states or add default in the description statement?
Best Regards,
/jan

On 28 Feb 2024, at 10:51, mohamed.boucadair@orange.com<mailto:mohamed.boucadair@orange.com> wrote:

Hi all,

I think that this version is ready for the WGLC.

The document fully covers the items promised when requesting adoption [1]. As listed in the ACK section, we also solicited and integrated feedback from many yangdoctors, solicited SAAG WG to review the security text, etc. Refer to 1.1 for a comprehensive list of the changes.

Cheers,
Med

[1] Slide#7 of https://datatracker.ietf.org/meeting/117/materials/slides-117-netmod-7-guidelines-for-authors-and-reviewers-of-documents-containing-yang-data-models-00

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Objet : I-D Action: draft-ietf-netmod-rfc8407bis-09.txt

Internet-Draft draft-ietf-netmod-rfc8407bis-09.txt is now available.
It is a work item of the Network Modeling (NETMOD) WG of the IETF.

  Title:   Guidelines for Authors and Reviewers of Documents
Containing YANG Data Models
  Authors: Andy Bierman
           Mohamed Boucadair
           Qin Wu
  Name:    draft-ietf-netmod-rfc8407bis-09.txt
  Pages:   84
  Dates:   2024-02-28

Abstract:

  This memo provides guidelines for authors and reviewers of
  specifications containing YANG modules, including IANA-maintained
  modules.  Recommendations and procedures are defined, which are
  intended to increase interoperability and usability of Network
  Configuration Protocol (NETCONF) and RESTCONF protocol
  implementations that utilize YANG modules.  This document obsoletes
  RFC 8407.

  Also, this document updates RFC 8126 by providing additional
  guidelines for writing the IANA considerations for RFCs that
specify
  IANA-maintained modules.

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