rss feedback problems

report=Hi there ;]
I get feedback with notice:
Error: Your document does not contain any RDF statement.
What I must change to creat valid code ?. Is there any sugestion form Your
W3-side why i've got this notice ?
Regards

Matthew Kimont
---------------
<?xml version="1.0"?>
<!DOCTYPE rss PUBLIC "-//Netscape Communications//DTD RSS 0.91//EN"
"http://my.netscape.com/publish/formats/rss-0.91.dtd">
<rss version="0.91">

<channel>
<title>x</title>
<link>x</link>
<description>x</description>
<language>x</language>

<item>
<title>x</title>
<link>x</link>
<description>x</description>
</item>

<lastBuildDate>x</lastBuildDate>
<webMaster>x</webMaster>
</channel>
</rss>
------------
RDF=<?xml version="1.0">

Received on Thursday, 7 September 2006 19:48:32 UTC