Represents an XP Orb in the world.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import.
import crafttweaker.entity.IEntityXp;

IEntityXp extends IEntity. That means all functions available to IEntities also are available to IEntityXp.

ZenGetter	Возвращаемый тип
ZenGetter xp	Возвращаемый тип float