Re: [netmod] schema mount and YANG library

[Lou Berger <[e-mail]>]

On 1/17/2018 11:18 AM, Martin Bjorklund wrote:
...
>>> My main concern is actually the YL version.  I strongly think SM need
>>> to use YL-bis rather that the old YL, so that it can support NMDA.
>>>
>> Right now to SM is independent of Yang Library version and can run
>> with either.
> No this is not correct.  SM uses a grouping from the old YANG
> library (for the "use-schema" case),
I thought YLbis was an updat e to UL (i.e., no name change) as such SM 
can include either.

>   and talks about mounting
> "modules-state" ("inline" case).
In informative descriptions only.  Certainly these can be changed to 
allow for YL-bis if need be.

>> I certainly would expect use of Yang Library bis and nmda
>> to have advantages.
>>
>>> The implementation effort for supporting the new YL in clients and
>>> servers is minimal, esp. when compared to the efforts involved in
>>> supporting SM.
>>>
>>> Adding an indirection is (for me) less important, but it has the
>>> benefit of solving the two issues (a) and (b) above, and I haven't
>>> seen any technical problem with it.
>>>
>> (A) has implementation implications and those participating in the
>> discussion at the time expressed as not being worth the cost.
>> I don't believe b was seen as a significant issue either.
>>
>>> Do you have any technical concerns with using an annotation as an
>>> indirection?
>>>
>> The technicsl issue I have with the approaches the same one that was
>> raised when debated previously, ie the implementation overhead of
>> requiring inline schemas to be available at the top level.
> Ok.  I'm ok with keeping the inline case as it is.  However, I think
> we need to use the new YL-bis, so that we can support the NMDA.
Given that NMDA support is not yet fully defined, we're still in the 
transition period where support for both NMDA and non-NMDA 
implementations need to be considered.  Rob presented some options 
earlier in the thread that I think captures this.

Lou


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