Doc'd that assertXMLEqual()/assertXMLNotEqual() ignores XML declaration and comments.
@@ -1645,6 +1645,9 @@ your test suite.
syntax differences. When invalid XML is passed in any parameter, an
``AssertionError`` is always raised, even if both string are identical.
+ XML declaration and comments are ignored. Only the root element and its
+ children are compared.
+
Output in case of error can be customized with the ``msg`` argument.
.. method:: SimpleTestCase.assertXMLNotEqual(xml1, xml2, msg=None)
