This section describes the only QosPolicy that strictly applies to Topics (and no other types of Entities)—the TOPIC_DATA QosPolicy. For a complete list of the QosPolicies that can be set for Topics, see .
Most of the QosPolicies that can be set on a Topic can also be set on the corresponding DataWriter and/or DataReader. The Topic’s QosPolicy is essentially just a place to store QoS settings that you plan to share with multiple entities that use that Topic (see how in Setting Topic QosPolicies); they are not used otherwise and are not propagated on the wire.
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