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CK: 7/9/09 Psuedo-UML describing the cart object and the basic user scenarios.
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<img src="http://yuml.me/diagram/class/
[ProductCart
|
-id:int;
+name:string;
-status:bool;
+items:array;
|
+load(id);
+save(id);
+update();
+add(item);
+remove(item);
+clear();
|
+changed event
]
^-[Products|
+id:int;
+name:string;
]
"/>


<img src="http://yuml.me/diagram/class/
     [document
     |
     on Cart.change
     ]
     ^-
     [update display]
" />

<img src="http://yuml.me/diagram/usecase/
[User]-(click load),
     (click load)-(Cart.load),
     (click load)-(active cart|prompt to save),
     (active cart|prompt to save)-(go to save),
          (active cart|prompt to save)-(Cart.load),
               (Cart.load)-(Cart.changed),

[User]-(click save),
     (click save)-(prompt for cart name),
     (prompt for cart name)-(Cart.save),
     (Cart.save)-(Cart.clear),
     (Cart.clear)-(Cart.changed),
     (click save)-(not login|prompt for login),
     (not login|prompt for login)-(prompt for cart name),
     (not login|prompt for login)-(go to login),

[User]-(click item),
     (click item)-(Cart.add/remove),
          (Cart.add/remove)-(logged in|Cart.update),
               (logged in|Cart.update)-(Cart.changed),
          (Cart.add/remove)-(Cart.changed)
" />