module xyzzy {
  namespace xyzzy;
  prefix xyzzy;

  feature bar;

  grouping foo {
    container foo;
  }

  container bar {
    if-feature bar;

    uses foo {
      augment foo {
        leaf foo {
          type string;
        }
      }
      refine foo {
        description desc;
      }
    }
  }
}