docs: def create_xml(self, useNamespace=False):
          """Create an ElementTree representation of the object."""
          UNTL_NAMESPACE = 'http://digital2.library.unt.edu/untl/'
          UNTL = '{%s}' % UNTL_NAMESPACE
  
          NSMAP = {'untl': UNTL_NAMESPACE}
  
          if useNamespace:
              root = Element(UNTL + self.tag, nsmap=NSMAP)
          else:
              root = Element(self.tag)
  
          # Sort the elements by the index of
          # UNTL_XML_ORDER pre-ordered list.
          self.sort_untl(UNTL_XML_ORDER)
          # Create an XML structure from field list.
          for element in self.children:
              if useNamespace:
                  create_untl_xml_subelement(root, element, UNTL)
              else:
                  create_untl_xml_subelement(root, element)
          return root