How to make a Yang container mandatory?

[Steven Li]

Based on YANG 1.1, you can make a container and all the leafs under the container as mandatory, eg:

      container rsp {
          mandatory true;
          leaf interface {
            type string;
          }
          leaf logicalInterfaceId {
            type uint16;
          }
      }

But I got error when try to run the make:

 error: unexpected keyword 'mandatory'

So how to make a container and all the leaf under the container as mandatory in NSO?

[vleijon · Accepted solution]

I might be mistake, but RFC7950 states:

7.5.2.  The container's Substatements

                 +--------------+---------+-------------+
                 | substatement | section | cardinality |
                 +--------------+---------+-------------+
                 | action       | 7.15    | 0..n        |
                 | anydata      | 7.10    | 0..n        |
                 | anyxml       | 7.11    | 0..n        |
                 | choice       | 7.9     | 0..n        |
                 | config       | 7.21.1  | 0..1        |
                 | container    | 7.5     | 0..n        |
                 | description  | 7.21.3  | 0..1        |
                 | grouping     | 7.12    | 0..n        |
                 | if-feature   | 7.20.2  | 0..n        |
                 | leaf         | 7.6     | 0..n        |
                 | leaf-list    | 7.7     | 0..n        |
                 | list         | 7.8     | 0..n        |
                 | must         | 7.5.3   | 0..n        |
                 | notification | 7.16    | 0..n        |
                 | presence     | 7.5.5   | 0..1        |
                 | reference    | 7.21.4  | 0..1        |
                 | status       | 7.21.2  | 0..1        |
                 | typedef      | 7.3     | 0..n        |
                 | uses         | 7.13    | 0..n        |
                 | when         | 7.21.5  | 0..1        |
                 +--------------+---------+-------------+

I do not see a mandatory statement there. Am I missing some later revision of the standard?

Anyhow, a (non-presence) container is mandatory if at least one leaf is mandatory, so you can achieve the same effect by making all leafs in the container mandatory.

[Steven Li]

Hi Vleijon,

Thank you very much for your reply!

The container's mandatory statement seems someone's suggestion to the standard:

https://www.ietf.org/mail-archive/web/netmod/current/msg09786.html

Somehow it makes sense to me.