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