module mod {

    prefix m;

    namespace "urn:cesnet:mod";

    grouping gr {

        container login {

            leaf username { type t_log; }

            leaf password {

                type string {

                    length "8..255";

                }

            }

        }

    }

    typedef t_log {

        type string {

            pattern '[a-zA-Z][a-zA-Z0-9_]*';

            length "6..255";

        }

    }

}