code: def el_is_empty(el):
      
      if len(el) == 1 and not isinstance(el[0], (list, tuple)):
          return True
      subels_are_empty = []
      for subel in el:
          if isinstance(subel, (list, tuple)):
              subels_are_empty.append(el_is_empty(subel))
          else:
              subels_are_empty.append(not bool(subel))
      return all(subels_are_empty)
docs: Return ``True`` if tuple ``el`` represents an empty XML element.