module bar {
    namespace bar;
    prefix bar;
    yang-version 1.1;

    revision 2017-02-02;

    typedef my-base-bits-type {
        type bits {
            bit bit-a {
                position 1;
            }
            bit bit-b;
            bit bit-c {
                position 3;
            }
            bit bit-d {
                position 4;
            }
        }
    }

    typedef my-derived-bits-type {
        type my-base-bits-type {
            bit bit-b;
            bit bit-c {
                position 3;
            }
            bit bit-d {
                position 6;
            }
        }
    }

    leaf my-bits-leaf {
        type my-derived-bits-type {
            bit bit-b;
            bit bit-c {
                position 3;
            }
        }
    }
}