docs: def element_to_int(element, attribute=None):
      """Convert ``element`` object to int. If attribute is not given, convert ``element.text``.
  
      :param element: ElementTree element
      :param attribute: attribute name
      :type attribute: str
      :returns: integer
      :rtype: int
      """
      if attribute is not None:
          return int(element.get(attribute))
      else:
          return int(element.text)