[netmod] References to the "tags" typedef

"Rob Wilton (rwilton)" <rwilton@cisco.com> Thu, 03 October 2019 09:38 UTC

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From: "Rob Wilton (rwilton)" <rwilton@cisco.com>
To: Christian Hopps <chopps@chopps.org>, "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: References to the "tags" typedef
Thread-Index: AdV5zjrR87+ocsTFRHuyDJWUSmakTQ==
Date: Thu, 3 Oct 2019 09:37:57 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/VYwlvItKibZ-gHUugd-OYmdGl5E>
Subject: [netmod] References to the "tags" typedef
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Hi Chris,

I know that this is late, but ...

The YANG packages draft (https://tools.ietf.org/html/draft-rwilton-netmod-yang-packages-01, but an updated version will be posted soon), is currently using the module-tags typedef to allow a package definition to contain a list of tags.

E.g. 
module: ietf-yang-package
       +--ro yang-package
          +--ro name                      yang:yang-identifier
          +--ro version                   yang-sem-ver
          +--ro revision-date?            yanglib:revision-identifier
          +--ro location*                 inet:uri
          +--ro description?              string
          +--ro reference?                string
          +--ro previous-version?         yang-sem-ver
          +--ro tag*                      tags:tag
          +--ro referentially-complete?   Boolean
          ...

This package definition goes into an instance data document, for which the schema should just be ietf-yang-package, but by it importing ietf-module-tags.yang, it effectively also pulls in the "container module-tags" into the schema for the package definition, that I don't think should be there.

If we keep package tags, then I think that there are two ways to fix this:

(1) Split ietf-module-tags into an ietf-module-tags-types.yang and a ietf-module-tags.yang.  But it would be very late to do this, and the packages draft isn't even a workgroup document at this stage.

(2) Have the package draft define its own "package tag" typedef, and not have an import reference on module-tags at all.  Probably if we do keep package tags, then we should also consider a mechanism by which they can be updated on a device equivalently to module tags.

I'm currently thinking that the second choice might be a better approach at this time, but wanted to check whether you or the WG had an opinion.

Thanks,
Rob



> -----Original Message-----
> From: netmod <netmod-bounces@ietf.org> On Behalf Of Christian Hopps
> Sent: 25 September 2019 17:19
> To: netmod@ietf.org
> Subject: Re: [netmod] I-D Action: draft-ietf-netmod-module-tags-09.txt
> 
> This adds the deprecated non-NMDA state module.
> 
> Thanks,
> Chris.
> 
> > On Sep 25, 2019, at 12:15 PM, internet-drafts@ietf.org wrote:
> >
> >
> > A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> > This draft is a work item of the Network Modeling WG of the IETF.
> >
> >        Title           : YANG Module Tags
> >        Authors         : Christian Hopps
> >                          Lou Berger
> >                          Dean Bogdanovic
> > 	Filename        : draft-ietf-netmod-module-tags-09.txt
> > 	Pages           : 18
> > 	Date            : 2019-09-25
> >
> > Abstract:
> >   This document provides for the association of tags with YANG modules.
> >   The expectation is for such tags to be used to help classify and
> >   organize modules.  A method for defining, reading and writing a
> >   modules tags is provided.  Tags may be registered and assigned during
> >   module definition; assigned by implementations; or dynamically
> >   defined and set by users.  This document also provides guidance to
> >   future model writers; as such, this document updates RFC8407.
> >
> >
> > The IETF datatracker status page for this draft is:
> > https://datatracker.ietf.org/doc/draft-ietf-netmod-module-tags/
> >
> > There are also htmlized versions available at:
> > https://tools.ietf.org/html/draft-ietf-netmod-module-tags-09
> > https://datatracker.ietf.org/doc/html/draft-ietf-netmod-module-tags-09
> >
> > A diff from the previous version is available at:
> > https://www.ietf.org/rfcdiff?url2=draft-ietf-netmod-module-tags-09
> >
> >
> > Please note that it may take a couple of minutes from the time of
> > submission until the htmlized version and diff are available at
> tools.ietf.org.
> >
> > Internet-Drafts are also available by anonymous FTP at:
> > ftp://ftp.ietf.org/internet-drafts/
> >
> > _______________________________________________
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> >