Uses of Interface
org.bukkit.persistence.PersistentDataHolder

Packages that use PersistentDataHolder 
Package Description
org.bukkit
The root package of the Bukkit API, contains generalized API classes.
org.bukkit.block
Classes used to manipulate the voxels in a world, including special states.
org.bukkit.entity
Interfaces for non-voxel objects that can exist in a world, including all players, monsters, projectiles, etc.
org.bukkit.entity.minecart
Interfaces for various Minecart types.
org.bukkit.inventory.meta
The interfaces used when manipulating extra data can can be stored inside item stacks.