code: def indent_xml(elem, level=0, more_sibs=False):
      
      i = "\n"
      pad = "    "
      if level:
          i += (level - 1) * pad
      num_kids = len(elem)
      if num_kids:
          if not elem.text or not elem.text.strip():
              elem.text = i + pad
              if level:
                  elem.text += pad
          count = 0
          for kid in elem:
              if kid.tag == "data":
                  kid.text = "*DATA*"
              indent_xml(kid, level + 1, count < num_kids - 1)
              count += 1
          if not elem.tail or not elem.tail.strip():
              elem.tail = i
              if more_sibs:
                  elem.tail += pad
      else:
          if level and (not elem.tail or not elem.tail.strip()):
              elem.tail = i
              if more_sibs:
                  elem.tail += pad
docs: Indent an xml element object to prepare for pretty printing.
  
      To avoid changing the contents of the original Element, it is
      recommended that a copy is made to send to this function.
  
      Args:
          elem: Element to indent.
          level: Int indent level (default is 0)
          more_sibs: Bool, whether to anticipate further siblings.