module b {

  namespace "urn:b";

  prefix b_mod;

  revision 2015-01-01 {

    description

      "version 1";

    reference "RFC XXXX";

  }

  feature foo;

  grouping gg {

    leaf bar-gggg {

      type string;

    }

  }

  container x {

    leaf bar-leaf {

      type string;

    }

    uses gg;

    leaf baz {

      if-feature foo;

      type string;

    }

    leaf bubba {

      type string;

    }

  }

  rpc foo-rpc {

    if-feature foo;

  }

}