See: Description

| Interface | Description | 
|---|---|
| Hierarchical<O> | Interface for objects with an internal hierarchy interface. | 
| Hierarchy<O> | This interface represents an (external) hierarchy of objects. | 
| ModifiableHierarchy<O> | Modifiable Hierarchy. | 
| Class | Description | 
|---|---|
| HierarchyHashmapList<O> | Centralized hierarchy implementation, using a HashMap of Lists. | 
| HierarchyReferenceLists<O extends Hierarchical<O>> | Hierarchy implementation with a per-object representation. | 
Delegate implementation of a hierarchy.