code: public int convertExternalToInternal(Object recordOwner)
      {
          boolean bSuccess = this.getMessage().setDOM(this.getDOM());
          return bSuccess ? DBConstants.NORMAL_RETURN : DBConstants.ERROR_RETURN; 
      }
docs: Convert the external form to the internal message form.
  You must override this method.
  @param externalMessage The received message to be converted to internal form.
  @return The internal message.