| Interface | Description | 
|---|---|
| Watchable | 
 This interface is used to fetch WatchDataSource instances that have been created and registered 
 | 
| WatchDataSource | 
 The WatchDataSource interface defines the semantics for a Watch to store Calculable records 
 | 
| Class | Description | 
|---|---|
| Calculable | 
 A Calculable implements support required by the Calculable interface 
 | 
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