If the event is of type RequestCancelExternalWorkflowExecutionInitiated then this member is set and provides detailed information
            about the event. It is not set for other event types.
             
            
 Declaration Syntax
 Declaration Syntax| C# | 
public RequestCancelExternalWorkflowExecutionInitiatedEventAttributes RequestCancelExternalWorkflowExecutionInitiatedEventAttributes { get; set; }