| Package | Description | 
|---|---|
| org.bukkit.attribute | 
 Classes relevant to attributes. 
 | 
| org.bukkit.entity | 
 Interfaces for non-voxel objects that can exist in a  
world, including all players, monsters, projectiles, etc. | 
| org.bukkit.inventory.meta | 
 The interfaces used when manipulating extra data can can be stored inside
  
item stacks. | 
| Class | Description | 
|---|---|
| Attribute | 
 Types of attributes which may be present on an  
Attributable. | 
| AttributeInstance | 
 Represents a mutable instance of an attribute and its associated modifiers
 and values. 
 | 
| AttributeModifier | 
 Concrete implementation of an attribute modifier. 
 | 
| AttributeModifier.Operation | 
 Enumerable operation to be applied. 
 | 
| Class | Description | 
|---|---|
| Attributable | 
 Represents an object which may contain attributes. 
 | 
| Class | Description | 
|---|---|
| Attribute | 
 Types of attributes which may be present on an  
Attributable. | 
| AttributeModifier | 
 Concrete implementation of an attribute modifier. 
 | 
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