code: public Map<String,NameValue> getValueMap(boolean bAddIfNotFound)
      {
          if (m_mapNameValue == null)
              if (bAddIfNotFound)
                  m_mapNameValue = new Hashtable<String,NameValue>();
          return m_mapNameValue;
      }
docs: Get the next Lower nodes.
  @param bAddIfNotFound If true, set up a new value map if not set up yet.
  @return The value map.