/**
* Return book page URL
*
* @param string $book_name
* @param string $page_slug
* @return string
*/
private static function getBookPageUrl($book_name, $page_slug)
{
return self::pageLevelToPrefix(self::$current_element->getPageLevel()) . 'books/' . $book_name . '/' . $page_slug . '.html';
}
