code: public static void assertXpathsNotEqual(String controlXpath,
                                              Document controlDocument,
                                              String testXpath,
                                              Document testDocument)
          throws XpathException {
          assertXpathEquality(controlXpath, controlDocument, testXpath,
                              testDocument, false);
      }
docs: Assert that the node lists of two Xpaths in two documents are NOT equal
  @param controlXpath
  @param testXpath
  @param controlDocument
  @param testDocument
  @see XpathEngine