Each attribute of each object has an owner: the owner is the federate responsible for updating that attribute
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Called "owner-computes rule"! Any object must be updated by a particular federate
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Different attributes of the same object may have different owners. One federate is updating an aircraft's position; another federate, subscribing to the position, is updating icing
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"Privilege to delete" an object is an attribute owned by some federate
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Ownership can change: responsibility for updating an attribute can pass from one federate to another. E.g., an aircraft modeled in an aggregate simulation could transfer ownership of the position attribute to a cockpit
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Ownership exchange may be pushed or pulled
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