Allow federates to specify the distribution conditions for the specific data they send or expect to receive
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RTI uses this information to route data as specified in declaration management services
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Not bound by FOM, data distribution can be managed based on other characteristics of objects important to particular federation execution
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Federation design creates `routing spaces' for use during runtime; these are specified at federation creation time
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Interface functions include
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Create and modify `update' and `subscription' regions to bound routing space
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Associate update regions with specific object instances
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Change thresholds for changing regions
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Critical for efficient implementations -- SIMNET broadcast updates to every process and this does not scale
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