array( 'table' => 'menu_links', 'left_table' => 'book', 'left_field' => 'mlid', 'field' => 'mlid', ), ); $data['draggableviews_book_structure']['book'] = array( 'title' => t('All sub nodes of this book page.'), 'help' => t('All sub nodes of this book page.'), 'argument' => array( 'handler' => 'views_handler_argument_draggableviews_book', ), ); return $data; }