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        Someone creates a new document
            |    
...
                        Status: 'under editorial review'.

And several more options below, but you get the idea I hope.

Ticket::new(String group, String username, String documentID); # other
+ values will come from the db
Ticket::save;
Ticket::move(String direction, int steps); # e.g., forward if okayed, 
                                           # back if not okay, sometim
+es even 
                                           # back to the beginning.

package Track;
our %switch = (); # to be filled in by subclasses.
...
    # out which subroutine in %Track::switch to call.
    # This would be called from Ticket::move most likely.
}