| Class | Description | 
|---|---|
| CachingFeatureCollection | 
 Caches features to prevent unnecessary queries. 
 | 
| DynamicFeatureCollection | |
| ThreadSafeFeatureCollectionWrapper | 
 Thread safety is achieved by (1) synchronizing the methods, and (2) creating
 new Collections in #getFeatures, #query, and #iterator to prevent
 ConcurrentModificationExceptions. 
 |