<region name="Trade_gateway_sender_delta_proxy" refid="PARTITION_REDUNDANT">
  <region-attributes gateway-sender-ids="ny">
    <partition-attributes colocated-with="/Trade" redundant-copies="1"/>
    <cache-writer>
      <class-name>example.server.callback.GatewaySenderProxyCacheWriter</class-name>
    </cache-writer>
  </region-attributes>
</region>