private function isValidSelectionMethod($selectionMethod)
    {
        return in_array($selectionMethod, [
            self::SELECTION_BROWSE,
            self::SELECTION_DROPDOWN,
            self::SELECTION_LIST_WITH_RADIO_BUTTONS,
            self::SELECTION_LIST_WITH_CHECKBOXES,
            self::SELECTION_MULTIPLE_SELECTION_LIST,
            self::SELECTION_TEMPLATE_BASED_MULTIPLE,
            self::SELECTION_TEMPLATE_BASED_SINGLE,
        ], true);
    }