module mod4 {

    prefix abc;

    namespace "urn:cesnet:mod4";

    typedef my {

        type string {

            length "1..255" {

                reference "test reference";

                error-app-tag "test tag";

                description "test description";

                error-message "test error message";

                error-message "test"; // duplicated

            }

        }

    }

}