public static function step_structure_returns() {
        return new external_single_structure([
            'title'             => new external_value(PARAM_RAW,
                    'Step Title'),
            'content'           => new external_value(PARAM_RAW,
                    'Step Content'),
            'element'           => new external_value(PARAM_TEXT,
                    'Step Target'),
            'placement'         => new external_value(PARAM_TEXT,
                    'Step Placement'),
            'delay'             => new external_value(PARAM_INT,
                    'Delay before showing the step (ms)', VALUE_OPTIONAL),
            'backdrop'          => new external_value(PARAM_BOOL,
                    'Whether a backdrop should be used', VALUE_OPTIONAL),
            'reflex'            => new external_value(PARAM_BOOL,
                    'Whether to move to the next step when the target element is clicked', VALUE_OPTIONAL),
            'orphan'            => new external_value(PARAM_BOOL,
                    'Whether to display the step even if it could not be found', VALUE_OPTIONAL),
            'stepid'            => new external_value(PARAM_INT,
                    'The actual ID of the step', VALUE_OPTIONAL),
        ]);
    }