Discriminators help restrict the policy to a specific case, so certain special cases can be described and handled specially. For example, a non-final policy can deny all block break, but then another can allow breaking sand and gravel, making the zone excavatable, but not ruinable.

Evaluation Context

All discriminators are evaluated in a certain situation, e.g. when a player breaks a block. The situation has certain parameters: typically the event, the source of the event, and its target. In case of a block break event, the event is block breaking, the source is the player who breaks the block, and the target is the block. Additionally, a fourth context property is the zone itself, which the evaluation is evaluated for.

Event Discriminators

• ATTACK: damages another entity
• HURT: takes damage
• BLOCK: any block interaction
• BLOCK>BREAK: break any block
• BLOCK>PLACE: place any block
• ITEM: do something with an item (the item being the interesting object)
• ITEM>DROP: drop an item on the ground (applies to death too!)
• ITEM>PICKUP: pick up an item
• ITEM>SHOOT: shoots an arrow, snowball, etc.
• ITEM>ARMOR: interacts with armor stand
• ITEM>ARMOR>ARMOR_PLACE: place item onto armor stand
• ITEM>ARMOR>ARMOR_GRAB: pick up item from armor stand
• ITEM>INVENTORY: any inventory event
• ITEM>INVENTORY>WITHDRAW: pick item from inventory
• ITEM>INVENTORY>DEPOSIT: place item into inventory
• ITEM>INVENTORY>BROWSE: open an inventory due to world interaction