Declare variable in class declaration    #define.CurrentVersion(1)      #localmacro.CurrentList        _itmeid, _description, _classtype      #endmacr    define pack method    public container pack()    {      return [#CurrentVersion,#CurrentList];    }    Then define unpack method    public boolean unpack(container _packedClass)    {      Version version = conpeek(_packedClass,1);      ;      switch (version)      {        case #CurrentVersion :          [version, #CurrentList] = _packedClass;        break;        default :          return false;      }      return true;    }     
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