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When the primary key is specified, then the specialized create(), find(), destroy() and get_primary_key() operations are defined.
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Primary key value uniquely identifies a component instance in the context of the home. The implementation of Home keeps the association between the primary key value and the component instance.
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create() operation creates a component instance.
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home definition can also contain factory and finder definitions to specify a factory and finder operations. These descriptions contain the name and parameters of the operation.
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