code: public StringBuffer addXML(StringBuffer sbXML)
      {
          Util.addStartTag(sbXML, BaseMessage.HEADER_TAG).append(Constant.RETURN);
          for (String strKey : this.getProperties().keySet())
          {
              Object data = this.get(strKey);
              Util.addStartTag(sbXML, strKey);
              sbXML.append(data);
              Util.addEndTag(sbXML, strKey).append(Constant.RETURN);
          }
          Util.addEndTag(sbXML, BaseMessage.HEADER_TAG).append(Constant.RETURN);
          return sbXML;
      }
docs: Get the message header data as a XML String.
  @return