Re: [netmod] [Technical Errata Reported] RFC7950 (5879)

["Rob Wilton (rwilton)" <[e-mail]>]

Yes.

I've raised https://github.com/netmod-wg/yang-next/issues/96 to track this.  Please modify/extend as appropriate.

Thanks,
Rob


> -----Original Message-----
> From: Schönwälder, Jürgen <[e-mail]>
> Sent: 22 October 2019 16:38
> To: Rob Wilton (rwilton) <[e-mail]>
> Cc: Martin Bjorklund <[e-mail]>; [e-mail];
> [e-mail]; [e-mail]; [e-mail]
> Subject: Re: [netmod] [Technical Errata Reported] RFC7950 (5879)
> 
> So we need to extend and clarify the terminology but this can't be done
> via an errata. Looking at the RFC 8342 terms, we may need to also define
> 'module schema', which is pretty much what the current 'schema tree'
> definition is (or we just keep that definition).
> 
> (I am not sure 'YANG schema' as proposed in the packages work is a  good
> term, but then this is a draft and this can be improved.)
> 
> I am also not sure that 'set of all modules implemented by a server'
> (proposed by Lada) is a good definition; in the NMDA world, a server
> implements several datastores and each datastore has a datastore schema
> and they can be different.
> 
> Bottom line: I think the errata should be rejected and we should check
> that we have a proper issue on the YANG issue next tracker to address this
> terminology issue in the future.
> 
> /js
> 
> On Tue, Oct 22, 2019 at 03:15:49PM +0000, Rob Wilton (rwilton) wrote:
> > I agree with Lada that having such a definition would be useful.
> >
> > But I also agree with Martin that this isn't really an erratum.
> >
> > It is also worth noting that RFC 8342 defines:
> >
> >    o  schema node: A node in the schema tree.  The formal definition is
> >       provided in RFC 7950.
> >
> >    o  datastore schema: The combined set of schema nodes for all modules
> >       supported by a particular datastore, taking into consideration any
> >       deviations and enabled features for that datastore.
> >
> > The latest version of the packages draft (not posted yet), defines:
> >
> >    o  YANG schema: A datastore schema, not bound to any particular
> >       datastore.
> >
> > Thanks,
> > Rob
> >
> >
> > > -----Original Message-----
> > > From: netmod <[e-mail]> On Behalf Of Martin Bjorklund
> > > Sent: 22 October 2019 16:02
> > > To: [e-mail]
> > > Cc: [e-mail]; [e-mail]; [e-mail]
> > > Subject: Re: [netmod] [Technical Errata Reported] RFC7950 (5879)
> > >
> > > Hi,
> > >
> > > The problem is that it is not clear that we can use this new
> > > definition with the rest of the text in the RFC that uses this term.
> > > For example, section 7.1.5 talks about "the imported module's schema
> > > tree", and this doesn't really work if the schema tree is not tied
> > > to a module.
> > >
> > > Also the proposed definition is recursive since it is defined in
> > > terms of "schema node", and a "schema node" is already defined as "a
> > > node in the schema tree".
> > >
> > > So it probably makes sense to look at this definition (and the text
> > > and other definitions) if we do a document update, but as it is
> > > currently written I think it should be rejected.
> > >
> > >
> > > /martin
> > >
> > >
> > >
> > > RFC Errata System <[e-mail]> wrote:
> > > > The following errata report has been submitted for RFC7950, "The
> > > > YANG
> > > > 1.1 Data Modeling Language".
> > > >
> > > > --------------------------------------
> > > > You may review the report below and at:
> > > > https://www.rfc-editor.org/errata/eid5879
> > > >
> > > > --------------------------------------
> > > > Type: Technical
> > > > Reported by: Ladislav Lhotka <[e-mail]>
> > > >
> > > > Section: 3
> > > >
> > > > Original Text
> > > > -------------
> > > > o  schema tree: The definition hierarchy specified within a module.
> > > >
> > > >
> > > > Corrected Text
> > > > --------------
> > > > o  schema tree: The hierarchy of schema nodes defined in the set
> > > > of all
> > > modules
> > > >    implemented by a server, as specified in the YANG library data
> > > [RFC7895].
> > > >
> > > >
> > > >
> > > > Notes
> > > > -----
> > > > The original definition of the term has two problems:
> > > >
> > > > 1. Schema tree is not limited to a single module. Some YANG
> > > > constructs,
> > > such as augment and leafref type, may refer to a schema node that is
> > > defined in another module.
> > > >
> > > > 2. Apart from schema nodes, YANG modules contain definitions that
> > > > do not
> > > contribute to the schema tree: groupings, typedefs, identities etc.
> > > >
> > > > Instructions:
> > > > -------------
> > > > This erratum is currently posted as "Reported". If necessary,
> > > > please use "Reply All" to discuss whether it should be verified or
> rejected.
> > > > When a decision is reached, the verifying party can log in to
> > > > change the status and edit the report, if necessary.
> > > >
> > > > --------------------------------------
> > > > RFC7950 (draft-ietf-netmod-rfc6020bis-14)
> > > > --------------------------------------
> > > > Title               : The YANG 1.1 Data Modeling Language
> > > > Publication Date    : August 2016
> > > > Author(s)           : M. Bjorklund, Ed.
> > > > Category            : PROPOSED STANDARD
> > > > Source              : Network Modeling
> > > > Area                : Operations and Management
> > > > Stream              : IETF
> > > > Verifying Party     : IESG
> > > >
> > >
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> >
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> 
> --
> Juergen Schoenwaelder           Jacobs University Bremen gGmbH
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