CODEWITHSUNDEEP
schemamodelingietf-netmod-yang
fatiha.kafou
fatiha.kafou

Reputation: 81

Can a container inside a grouping be augmented in YANG?

The first module contains this:

module a
{
    namespace "my:namespace";
    prefix a;

    grouping mygrouping
    {
        container firstcontainer {
            list modules {
                leaf firstmodule;
                leaf secondmodule;
            }    
        }
    }
}

Now I want to augment it in the second module as follows:

module b
{
    namespace "my:namespace";
    prefix a;
    import b {
        prefix b;
    }
    augment "/b:mygrouping/b:firstcontainer/b:modules"{
        leaf thirdmodule;
    }
}

This does not work, apparently because a grouping cannot be augmented. But there must be a way, since what I really want to extend is the list, not the grouping itself.

Is there another way to have the intended result using another way ?

Upvotes: 1

Views: 2108

Answers (2)

Deb
Deb

Reputation: 663

https://datatracker.ietf.org/doc/html/rfc7950#section-7.12




7.13.  The "uses" Statement

   The **"uses" statement is used to reference a "grouping" definition**.
   It takes one argument, which is the name of the grouping.

   The **effect of a "uses" reference to a grouping is that the nodes
   defined by the grouping are copied into the current schema tree and
   are then updated according to the "refine" and "augment" statements**.

   The identifiers defined in the grouping are not bound to a namespace
   until the contents of the grouping are added to the schema tree via a
   "uses" statement that does not appear inside a "grouping" statement,
   at which point they are bound to the namespace of the current module.

Upvotes: 0

Paulo Gomes
Paulo Gomes

Reputation: 176

Augmenting a grouping is only possible when 'using' that grouping.

For example:

uses a:mygrouping {
    augment firstcontainer/modules {
        leaf thirdmodule {...}
    }
}

So this would need to be done every time the grouping is 'used'. YANG doesn't provide a way to augment a grouping abstractly, you can only do it on a per 'uses' basis.

Upvotes: 3

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