invalid namespace-value in feed element

<?xml version="1.0" encoding="utf-8"?>
<!--
Description:  invalid namespace-value in feed element
Message:      error
Author:       Validome Team <rss@validome.org>
Copyright:    2006 - www.validome.org
-->
<feed xmlns="http://www.w3.org/2005/ATOM">
  <title>Example Feed</title>
  <link rel="self" href="http://www.validome.org/check/RSS_validator/version/atom_1_0/action/xml/feed/2"/>
  <updated>2006-08-13T11:44:08Z</updated>
  <author>
    <name>test name</name>
  </author>
  <id>urn:uuid:60a76c80-d399-11d9-b93C-5798hnt64</id>
  <entry>
    <title>Example entry</title>
    <link rel="alternate" href="http://validome.org/atom03"/>
    <id>urn:uuid:73555-cfb8-4ebb-bbbb-80da123efa6a</id>
    <updated>2006-07-11T20:15:37Z</updated>
    <summary>summary text</summary>
  </entry>
</feed>