module mod1 {

    prefix abc;

    namespace "urn:cesnet:mod1";

    grouping gr {

        leaf l1 { type my; }

        typedef my {

            type string {

                pattern '[a-zA-Z]+';

                pattern 'host-.*';

                length "8..255";

            }

            description "test";

        }

        container presence {

            presence "enable";

        }

    }

    container ccc {

        uses gr {

            description "test description";

            description "test"; // duplicated

        }

    }

}