Interface to be implemented by classes which register with the engine to receive notifications of (i) the occurrence of process exceptions and (ii) possible process 'points' to be checked for exceptions.
The interface InterfaceX_Service defines the exception event methods that are passed from the engine to the exception service.
InterfaceX_EngineSideClient passes exception event calls from the engine to the exception service.
InterfaceX_EngineSideServer receives posts from the exception service and passes them as method calls to the Engine.
InterfaceX_ServiceSideClient posts method calls from an exception service to the YAWL engine.
InterfaceX_ServiceSideServer passes exception event calls from the engine to the exception service.
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