RDF element without an channel element

<?xml version="1.0" encoding="utf-8"?>
<!--
Description:  RDF element without an channel element
Message:      error
Author:       Validome Team <rss@validome.org>
Copyright:    2006 - www.validome.org
-->
<rdf:RDF
  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  xmlns="http://purl.org/rss/1.0/"
>

  <item rdf:about="http://www.validome.org/2006/08/09/rdfdb/index.html">
    <title>Putting RDF to Work</title>
    <link>http://www.validome.org/2006/08/09/rdfdb/index.html</link>
    <description>item description</description>
  </item>
</rdf:RDF>