<!--
Description:  source id
Expect:       source.planet_id == 'http://example.com/'
-->

<feed xmlns="http://www.w3.org/2005/Atom">
  <id>http://example.com/</id>
  <entry>
    <source>
      <id>http://example.org/</id>
    </source>
  </entry>
</feed>

