Page1 {"url": "http://drupal.org/"}
* Page2 {"url":"<front>", "description":"This is a menu link description."}
** Page3 {"url": "admin/content", "description" : "Whitespaces allowed"}
Page4 {"description":"By default links to front page if no/invalid path specified."}
* Page5 {"hidden":true}
* Page6 {"expanded":true,"hidden":true}
** Page7