[netmod] Another question about identityref with multiple base statements

[Italo Busi <[e-mail]>]

I have also another question about identityref with multiple base statements.

Let’s consider the following definitions:


identity base-1 {

  description

    "Base identity #1.";

}



identity base-2 {

  description

    "Base identity #2.";

}



identity a {

  base base-1;

  description

    "Identity A.";

}



identity a-1 {

  base base-2;

  base a;

  description

    "Identity A-1.";

}



identity b {

  base base-1;

  description

    "Identity B.";

}


identity b-1 {

  base base-2;

  base b;

  description

    "Identity B-1.";

}

And the following identityrefs:

leaf reference-1 {
  type identityref {
    base base-1;
  }
  description
    "Reference to an identity #1.";
}

leaf reference-2 {
  type identityref {
    base base-2;
  }
  description
    "Reference to an identity #2.";
}

In this case, my understanding is that all the possible pairs (a, a-1), (a, b-1), (a-1, a-1), (a-1, b-1), (b, a-1), (b, b-1), (b-1, a-1) and (b-1, b-1) would be valid values for reference-1 and reference-2.

Is my understanding correct?

Is there a way to restrict the possible values for reference-1 and reference-2 to a limited subset like (a, a-1) or (b, b-1)?

For example, would this code be valid?

leaf reference-2 {
  type identityref {
    base base-2;
  }
  must 'derived-from(../reference-2, ../reference-1)';
  description
    "Reference to an identity #2.";
}

If not, is there any other option to restrict the possible values for reference-1 and reference-2?

Thanks, Italo

Italo Busi
Principal Optical Transport Network Research Engineer

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