Re: [netmod] draft-ietf-netmod-rfc6991-bis: Comment on node-instance-identifier

Schönwälder, Jürgen <J.Schoenwaelder@jacobs-university.de> Mon, 04 November 2019 13:46 UTC

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From: =?iso-8859-1?Q?Sch=F6nw=E4lder=2C_J=FCrgen?= <J.Schoenwaelder@jacobs-university.de>
To: Per Hedeland <per@hedeland.org>
CC: Robert Wilton <rwilton@cisco.com>, "netmod@ietf.org" <netmod@ietf.org>, "draft-ietf-netmod-rfc6991-bis@ietf.org" <draft-ietf-netmod-rfc6991-bis@ietf.org>
Thread-Topic: [netmod] draft-ietf-netmod-rfc6991-bis: Comment on node-instance-identifier
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Date: Mon, 4 Nov 2019 13:46:45 +0000
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Subject: Re: [netmod] draft-ietf-netmod-rfc6991-bis: Comment on node-instance-identifier
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Hi,

what about this wording :

     [...]

      A node-instance-identifier value is an unrestricted
      YANG instance-identifier expression or the special
      value '/', which refers to the entire accessible tree.

     [...]

/js

On Mon, Nov 04, 2019 at 01:19:47PM +0100, Per Hedeland wrote:
> On 2019-11-04 11:32, Schönwälder, Jürgen wrote:
> > Hi,
> > 
> > this may be resolved by adding
> > 
> >       The special value '/' refers to the entire accessible tree.
> > 
> > to the description statement. Does this work for you?
> 
> Hm, it seems to me that this would conflict with this part of the
> description:
> 
>        A node-instance-identifier value is an
>        unrestricted YANG instance-identifier expression.
> 
>        All the same rules as an instance-identifier apply,
>        except that predicates for keys are optional.  If a key
>        predicate is missing, then the node-instance-identifier
>        represents all possible server instances for that key.
> 
> - since '/' is not a valid value for a YANG instance-identifier.
> I.e. if '/' should be included in the typedef (seems reasonable to
> me), the text for it probably needs to be "incorporated" in the text
> above.
> 
> --Per
> 
> > /js
> > 
> > On Mon, Sep 30, 2019 at 03:17:25PM +0100, Robert Wilton wrote:
> > > Hi Juergen,
> > > 
> > > Should the "node-instance-identify" type specify how the path "/" is
> > > treated?
> > > 
> > > I noted that in rfc8341, the behavior for "/" is described in the leaf
> > > "path" description rather than in the type definition, but I was thinking
> > > that it might be better if this behaviour was specified as part of the
> > > typedef.
> > > 
> > > Snippet from RFC8341:
> > > 
> > >               case data-node {
> > >                 leaf path {
> > >                   type node-instance-identifier;
> > >                   mandatory true;
> > >                   description
> > >                     "Data node instance-identifier associated with the
> > >                      data node, action, or notification controlled by
> > >                      this rule.
> > > 
> > >                      Configuration data or state data
> > >                      instance-identifiers start with a top-level
> > >                      data node.  A complete instance-identifier is
> > >                      required for this type of path value.
> > > 
> > >                      The special value '/' refers to all possible
> > >                      datastore contents.";
> > >                 }
> > >               }
> > > 
> > > Thanks,
> > > Rob
> > > 
> > 
> 

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>