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The integer constant CHANGED_LINK has the value
The number of prims making up the object or avatars seated on the object have changed. This event also occurs when duplicating a linked object or when a prim in an object changes type or shape. This event does not occur when: an object is attached or detached, in an attachment when the avatar sits or unsits, in an attachment when another object is attached or detached, or when a single prim is duplicated.
integer CHANGED_LINK = 0x20;