docs: def prettify(elem):
      # from xml.etree.ElementTree import Element, SubElement, Comment, tostring
      from xml.etree import ElementTree
      from xml.dom import minidom
      """Return a pretty-printed XML string for the Element.
      """
      rough_string = ElementTree.tostring(elem, 'utf-8')
      reparsed = minidom.parseString(rough_string)
      return reparsed.toprettyxml(indent="  ")