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| Class Summary | |
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| CollapsedReference<T> | A collapsed reference is a property that potentially has a value, but the property's value has not been expanded at the time fo the request. | 
| EmptyReference<T> | A null object reference, indicates that the referenced property is empty. | 
| ExpandedReference<T> | An expanded reference has a value, call get() will return that referent value. | 
| Reference<T> | A reference to a model object. | 
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