See: Description
| Annotation Type | Description | 
|---|---|
| Optional | 
 Indicates an optional interface: It doesn't have to be implemented or bound
 using TANG. 
 | 
| Provided | 
 Indicates that an implementation of the annotated class / interface will be
 provided by REEF at resourcemanager. 
 | 
| Unstable | 
 Indicates that the code annotated this way is unstable, both in terms of its APIs and its functionality. 
 | 
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