<?xml version="1.0" encoding="UTF-8"?>
<dds>
  <permissions>
    <grant name="signed-alice">
      <subject_name>CN=alice</subject_name>
      <allow_rule>
        <publish><topic>Chatter</topic></publish>
        <subscribe><topic>Echo</topic></subscribe>
      </allow_rule>
      <default>DENY</default>
    </grant>
  </permissions>
</dds>
