| Interface | Description | 
|---|---|
| Property<T> | 
 An observable value. 
 | 
| Property.ChangeListener<T> | 
 Listener to observe changes. 
 | 
| RankingHelper.RankTester<T> | 
 Helper callback interface for rank testing. 
 | 
| Class | Description | 
|---|---|
| Feature | 
 ECP feature representation. 
 | 
| Optional<T> | 
 A container object that may or may not contain a value. 
 | 
| RankingHelper<T> | 
 Ranking helper class to generically handle prioritization use cases. 
 | 
| Enum | Description | 
|---|---|
| Feature.STRATEGY | 
 Feature strategy enum. 
 | 
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