оператор переименования(Renames clause is used to give different names to existing data items. It is used to re-group the data names and give a new name to them. The new data names can rename across groups or elementary items. Alex_Odeychuk)
оператор размещения данных в памяти(Usage clause specifies the format in which the data is stored. If usage clause is specified on a group, then all the elementary items will have the same usage clause. Alex_Odeychuk)