[yang-doctors] Question on when statment and container presence

[Christian Hopps <[e-mail]>]

Hi,

The libyang folks have made a change in their libyang2 branch. The chnage is causing containers to be implicitly marked as presence containers if they include a "when" statement i.e.,:

module main {
  yang-version 1.1;
  namespace "http://example.com/main";
  prefix m;

  leaf afi-safi-name {
    type string;
  }
  container ipv4-flowspec {
    when "../afi-safi-name = 'ipv4-flowspec'";
    leaf flowspec-config {
      type uint8;
    }
  }
}

So in this case "ipv4-flowspec" is being changed as if it had a presence statement.

On of the authors indicated that this was supported indirectly by some mail on netmod; however, my search is not turning anything up.

I think this is incorrect as the presence of the container based on the when is an "implicit" (some other leaf value is set) not "explicit" meaning.

Thoughts?

Thanks,
Chris.