| Package | Description | 
|---|---|
| org.bukkit.block.data.type | Specific BlockData classes relevant to only a given block or set of blocks. | 
| Modifier and Type | Interface | Description | 
|---|---|---|
| interface  | Comparator | 'mode' indicates what mode this comparator will operate in. | 
| interface  | Door | 'hinge' indicates which hinge this door is attached to and will rotate around
 when opened. | 
| interface  | Gate | 'in_wall" indicates if the fence gate is attached to a wall, and if true the
 texture is lowered by a small amount to blend in better. | 
| interface  | Lectern | 'has_book' is a quick flag to check whether this lectern has a book inside
 it. | 
| interface  | NoteBlock | 'instrument' is the type of sound made when this note block is activated. | 
| interface  | Observer | |
| interface  | RedstoneRail | A type of minecart rail which interacts with redstone in one way or another. | 
| interface  | Repeater | 'delay' is the propagation delay of a repeater, i.e. | 
| interface  | Switch | |
| interface  | TrapDoor | |
| interface  | Tripwire | 'disarmed' denotes that the tripwire was broken with shears and will not
 subsequently produce a current when destroyed. | 
| interface  | TripwireHook | 
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