JMSSerializerBundle/Tests/Serializer/xml/circular_reference.xml

<?xml version="1.0" encoding="UTF-8"?>
<result>
  <collection>
    <entry>
      <name><![CDATA[child1]]></name>
    </entry>
    <entry>
      <name><![CDATA[child2]]></name>
    </entry>
  </collection>
  <another_collection>
    <entry>
      <name><![CDATA[child1]]></name>
    </entry>
    <entry>
      <name><![CDATA[child2]]></name>
    </entry>
  </another_collection>
</result>