Hi Michael,

Thank you for the clarification. This means we don't have to change anything in 
either BRSKI-PRM and constraint voucher, resp. in the general approach we use 
the voucher.

Best regards
Steffen

> -----Original Message-----
> From: Anima <[email protected]> On Behalf Of Michael Richardson
> Sent: Donnerstag, 28. Juli 2022 20:46
> To: [email protected]
> Cc: [email protected]
> Subject: Re: [Anima] mcr's YANG question raised during the ANIMA WG
> session
> 
> 
>     A---------> B
>      \          .
>       \          .
>        \          .
>         V          V
>         C . . . . > D
> 
> 
> I had lunch with Rob today and explained the situation.
> There are two answers!
> 
> If D is a new YANG module (/RFC) that wants to
>      augment B
> and  augment C
> 
> then it just works, and it's okay to say:
>      augment "B" {}
>      augment "C" {}
> 
> I was worried that this would *not* allowed.
> 
> i.e. D might not even add anything, although maybe it refines existing
>      things.
> 
> There is, however, another way to build a "D" that does not add anything,
> which is using
> 
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatat
> racker.ietf.org%2Fdoc%2Fdraft-ietf-netmod-yang-
> packages%2F&amp;data=05%7C01%7Csteffen.fries%40siemens.com%7C2f6
> a2caab69a45c5813308da70c97c84%7C38ae3bcd95794fd4addab42e1495d55a%
> 7C1%7C0%7C637946307930928893%7CUnknown%7CTWFpbGZsb3d8eyJWIjoi
> MC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C300
> 0%7C%7C%7C&amp;sdata=WIU6YlA2s%2BXi9%2FBOH3qvTq7R4f2JYAdXh8p5
> P%2BKXDVQ%3D&amp;reserved=0
> 
> In the context of ANIMA, A=>rfc8366, B=>brski-prm, C=>constrained-
> voucher.
> D=>a mythical constrianed-brski-prm.  Whether or not D needs an RFC
> because it creates new semantics is a different question.  {It might need an
> RFC for trade agreement reasons though}
> 
> 
> --
> Michael Richardson <[email protected]>, Sandelman Software Works
> -= IPv6 IoT consulting =-
> 
> 

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