module foo {
    namespace "foo";
    prefix foo;
    yang-version 1.1;

    identity my-identity {
        if-feature identity-feature;
    }

    feature identity-feature;
    feature mandatory-leaf;
    feature ssh;
    feature tls;
    feature two;
    feature three;

    container root {
        uses grp {
            refine grp-leaf {
                if-feature mandatory-leaf;
                mandatory true;
            }
        }
    }

    grouping grp {
        leaf grp-leaf {
            type empty;
        }
    }

    typedef my-enum {
        type enumeration {
            enum tcp;
            enum ssh {
                if-feature ssh;
            }
            enum tls {
                if-feature tls;
            }
        }
    }

    typedef my-bits {
        type bits {
            bit one;
            bit two {
                if-feature two;
            }
            bit three {
                if-feature three;
            }
        }
    }
}