module root {
    namespace root-ns;
    prefix root-pref;

    yang-version 1;
    
    import imported { prefix imp-pref; revision-date "2000-01-01"; }
    include submod;
    
    organization "cisco";
    contact "cisco email";

    container cont-helper {
        choice cont-choice {
            case c1 {
            }
            case c2 {
            }
        }
    }

    container cont {
        must "../cont-helper" {
            error-message "this is an error if helper not present";
        }
    }

    augment "/cont" {
        container cont-aug {
        }
    }

    notification notif1 {
    }

    rpc rpc1 {
    }

    deviation /imp-pref:cont {
        deviate add {
        }
        reference "deviate reference";
    }

    identity identity1 {
    }

    feature feature1 {
        description "feature1 description";
        reference "feature1 reference";
        status "current";
    }

    extension ext1 {
    }
}