docs: public void addMessageDataDesc(MessageDataParent messageDataDesc)
      {
          if (m_messageDataDescChildren == null)
              m_messageDataDescChildren = new HashMap<String,MessageDataDesc>();
          if (messageDataDesc != null)
          {
              m_messageDataDescChildren.put(((MessageDataDesc)messageDataDesc).getKey(), (MessageDataDesc)messageDataDesc);
              ((MessageDataDesc)messageDataDesc).setMessageDataParent(this);
          }
      }