在Element节点上进行Xpath

 　　　　　　　XPathFactory xPathFactory = XPathFactory.newInstance();
             XPath xpath = xPathFactory.newXPath();

             try {
                 String rdfID = xpath.evaluate("/validateResponse/id", respValtElement);
                 String rdfResult = xpath.evaluate("/validateResponse/content", respValtElement);

                 System.out.println("校验结果：" + rdfResult);
             } catch (XPathExpressionException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
             }