public class ToDoItem {
    public static class CompletedEvent extends ActionDomainEvent<ToDoItem> { }
    @Action(
        commandPublishing=Publishing.ENABLED,
        commandExecuteIn=CommandExecuteIn.FOREGROUND,          (1)
        commandPersistence=CommandPersistence.NOT_PERSISTED,   (2)
        domainEvent=CompletedEvent.class,
        hidden = Where.NOWHERE,                                (3)
        executionPublishing = Publishing.ENABLED,
        semantics = SemanticsOf.IDEMPOTENT
    )
    public ToDoItem completed() { /* ... */ }
}