code: public static Map<String, String> retrieveContextParam(Element element) {
          Map<String, String> contextParams = new HashMap<String, String>();
          NodeList elementsByTagName = element.getElementsByTagNameNS("*", "context-param");
          for (int i = 0; i < elementsByTagName.getLength(); i++) {
              Element subElement = (Element) elementsByTagName.item(i);
              contextParams.put(retrieveNodeValude(subElement, "param-name"),
                  retrieveNodeValude(subElement, "param-value"));
          }
          return contextParams;
      }
docs: <p>retrieveContextParam.</p>
  
  @param element a {@link org.w3c.dom.Element} object.
  @return a {@link java.util.Map} object.