Indicates if the process is atomic.
It isn't an extension (not standard) attribute of the process.
atomic=true - acknowledges Message(MEx) to its partner immediately
after executing Receive activity.
atomic=false - acknowledges Message(MEx) to its partner
when the instance completes.
the value of the atomic flag
Sets the value of the targetNamespace property.
Parameters: value - allowed object is String throws: VetoException - VetoExceptionwill be thrown if value if not acceptable astargetNamespace attribute here.