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+#
+# librarybookstate.pystate
+#
+# This state machine models the state of books in a library.
+#
+
+statemachine BookState:
+ New -(shelve)-> Available
+ Available -(reserve)-> OnHold
+ OnHold -(release)-> Available
+ Available -(checkout)-> CheckedOut
+ CheckedOut -(checkin)-> Available
+
+ # add states for restricted books
+ New -(restrict)-> Restricted
+ Available -(restrict)-> Restricted
+ Restricted -(release)-> Available
+ Restricted -(checkout)-> CheckedOutRestricted
+ CheckedOutRestricted -(checkin)-> Restricted