module Test {
    yang-version 1;
    namespace http://huawei.com;
    prefix Ant;
    list valid {
    key "invalid-interval";
    description "list description";
    config true;
    leaf invalid-interval {
        type "uint16";
        units "seconds";
        description "Interval before a route is declared invalid";
        mandatory true;
        status current;
        reference "RFC 6020";
        }
    }
}