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In this case, the shoppingCart field will be null if the ShoppingCart SSO does not exist, but will be non-null if it has been created (either by assigning a value to the field, or by a different SSO field where create is true).
Persistence Strategies
Main Article: Persistent Page Data
Each SSO is managed according to a persistence strategy. The default persistence strategy, "session", stores the SSOs inside the session. The session is created as needed.
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Configuring SSOs
Generally, you will need to configure your Session State Object if you want to change the persistence strategy to other than the default. (Right now there's only one built in strategy, but more will be coming in the future.)
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