code: public String getMessageClassName(TrxMessageHeader trxMessageHeader)
      {
          String strMessageClass = this.getProperty(trxMessageHeader, TrxMessageHeader.EXTERNAL_MESSAGE_CLASS);
          String strPackage = (String)trxMessageHeader.get(TrxMessageHeader.BASE_PACKAGE);
          strMessageClass = ClassServiceUtility.getFullClassName(strPackage, strMessageClass);
          return strMessageClass;
      }
docs: Get the external message container for this Internal message.
  Typically, the overriding class supplies a default format for the transport type.
  <br/>NOTE: The message header from the internal message is copies, but not the message itself.
  @param The internalTrxMessage that I will convert to this external format.
  @return The (empty) External message.