Re: [netmod] rfc6991bis: yang:xpath1.0

[Andy Bierman <[e-mail]>]

On Fri, Jul 24, 2020 at 2:40 AM Juergen Schoenwaelder <
[e-mail]> wrote:

> On Sat, Jul 18, 2020 at 09:00:42AM -0700, Andy Bierman wrote:
> > On Sat, Jul 18, 2020 at 8:42 AM Vladimir Vassilev <
> > [e-mail]> wrote:
> >
> > > On 17/07/2020 21.14, Juergen Schoenwaelder wrote:
> > >
> > > > - How do we deal with xpath expressions in other encodings
> > > > such as JSON. Do we assume an xpath context populated with
> > > > module names such that module names can be used to qualify
> > > > path expressions. This may need discussion and/or a new
> > > > definition.
> > > >
> > > > - This interacts with the definition of node-instance-identifier.
> > > >
> > > > - Options: (i) Leave this definition as it is. (ii) Detail how this
> > > > type work with encodings that use module names instead of prefixes
> > > > to qualify names.
> > > >
> > > > - Proposal: ?
> > >
> > >
> > > How about leaving the xpath1.0 type definition as it is and specifying
> a
> > > canonical form for the node-instance-identifier where namespace
> prefixes
> > > must be module names.
> > >
> > >
> > Since (i) is the only BC option why is (ii) even being considered?
> > Of course a new type name is needed to change the XPath syntax
> > to something that is not backward-compatible.
> >
>
> The idea was not to propose something non-backwards compatible but to
> try to explain how xpath1.0 values work with non-XML encodings. But
> perhaps this is 'unexplainable' in the sense that people deal with
> this in different ways.
>
>

IMO it is better to use a new type definition where the prefixes MUST be
module names
rather than overload a widely deployed type definition with semantics that
the prefixes
MAY be module names.

I prefer a new node-instance-identifier typedef, based on RFC 8040 sec.
3.5.3,
but that is another discussion.


/js
>


Andy


>
> --
> Juergen Schoenwaelder           Jacobs University Bremen gGmbH
> Phone: [phone]         Campus Ring 1 | 28759 Bremen | Germany
> Fax:   [phone]         <https://www.jacobs-university.de/>
>