code: def assert_xml_equal(first, second, check_tags_order=False):
      
      _assert_xml_compare(_assert_xml_docs_are_equal, first, second, check_tags_order=check_tags_order)
docs: Asserts that two xml documents are equal.
      :param first: first etree object or xml string
      :param second: second etree object or xml string
      :param check_tags_order: if False, the order of children is ignored
      :return: raises AssertionError if documents are not equal