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##### 8.5.7.2 Heterogeneous System

The GNAT environment provides default stream attributes, except for non-remote access types (see Transmitting Dynamic Structure and Marshalling and Unmarshalling Operations). The implementation of the default attributes of predefined types can be found in System.Stream_Attributes (s-stratt.adb).

The PolyORB PCS provides alternative data representations by default to ensure portability of the data stream across partitions executing on heterogeneous architectures. Users may override these representation aspects by configuring the protocol personality of their choice.