code: def create_untl_xml_subelement(parent, element, prefix=''):
      
      subelement = SubElement(parent, prefix + element.tag)
      if element.content is not None:
          subelement.text = element.content
      if element.qualifier is not None:
          subelement.attrib["qualifier"] = element.qualifier
      if element.children > 0:
          for child in element.children:
              SubElement(subelement, prefix + child.tag).text = child.content
      else:
          subelement.text = element.content
  
      return subelement
docs: Create a UNTL XML subelement.