code: def _unpack_episode(element: ET.Element):
      
      return Episode(
          epno=element.find('epno').text,
          type=int(element.find('epno').get('type')),
          length=int(element.find('length').text),
          titles=tuple(_unpack_episode_title(title)
                       for title in element.iterfind('title')),
      )
docs: Unpack Episode from episode XML element.