code: public static void assertXpathValuesNotEqual(String controlXpath,
                                                   String inControlXMLString,
                                                   String testXpath,
                                                   String inTestXMLString)
          throws SAXException, IOException,
                 XpathException {
          assertXpathValuesNotEqual(controlXpath,
                                    XMLUnit.buildControlDocument(inControlXMLString),
                                    testXpath,
                                    XMLUnit.buildTestDocument(inTestXMLString));
      }
docs: Assert that the evaluation of two Xpaths in two XML strings are
  NOT equal
  @param controlXpath
  @param inControlXMLString
  @param testXpath
  @param inTestXMLString
  @throws SAXException
  @throws IOException