Re: [netmod] augment and if-feature

[[e-mail] (Dale R. Worley)]

Robert Wilton <[e-mail]> writes:
> It isn't just any if-feature on the container that is being augmented 
> that needs to be considered.  You would have to consider all if-feature 
> statements by walking up the augmented node's ancestors to the top of 
> the tree and combine them, or have multiple if-feature statements.

Yes, I would expect that.

> Further, the 7950 YANG update rules allow for the augmented module to be 
> revised and some of those if-feature statements to be subsequently 
> removed.  If the augmenting module had restated the if-feature 
> conditions then this would probably leave the augmenting module 
> unintentionally out of sync with the module that it is augmenting.

It's an interesting sort of out-of-sync, though, as nothing would be
*incorrect*.  With some combinations of features, the augmented node
would have the agumentation and with some, it would not.  But it seems
to me that is quite OK, since whatever depends on the presence of the
augmentation (e.g., client logic or XPath expressions in the
augmentation) only expects the augmentation to be there if the
additional feature is present.

Dale