Re: [netmod] xpath expressions in JSON

[Andy Bierman <[e-mail]>]

On Thu, Oct 11, 2018 at 9:45 AM, Robert Wilton <[e-mail]> wrote:

>
> ....
>
>>
>> Finally, I'm trying to figure out have RFC 8040 query parameter (sect
>>> 4.8.4), which also uses XPath expressions is meant to work. That
>>> states:
>>>
>>> The set of namespace declarations is the set of prefix and
>>>        namespace pairs for all supported YANG modules, where the prefix
>>>        is the YANG module name and the namespace is as defined by the
>>>        "namespace" statement in the YANG module.
>>>
>> Perfect!  It seems the authors of 8040 thought of this ;-)
>>
> OK, what you propose would at least be consistent with how the XPath is
> formed in sec 8040, 4.8.4?
>
> I can live with that.  But still strongly think that WG should think of
> trying to move YANG on from Xpath 1.0.
>


I do not agree YANG should change any statements where XPath is being used.
(Note that leafs like the filter are free to use whatever data type they
want, including yang:xpath1.0).

The WG is on the right track already wrt/ XPath by creating custom XPath
functions
like 'deref' that simplify syntax or extend functionality.



>
>> Yet the examples in section 8.3.6 don't seem to use namespace prefixes
>>> in very many places, e.g. why is it "/example-mod:event1/name='joe'"
>>> and not "/example-mod:event1/example-mod:name='joe'"?  Is the example
>>> wrong, or otherwise what am I missing? :-)
>>>
>> It seems the example is wrong!
>>
> Please can you check section 8040, 8.3.6.  Are all the examples wrong?
>
> Thanks,
> Rob
>
>
>>
>> /martin
>> .
>>
>>
>

Andy