<?xml version="1.0"?>
<rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/" >
<channel>
<category><![CDATA[Category 1]]></category>
<category domain="http://example.com/">Category 2</category>
<item>
<category><![CDATA[Category 1]]></category>
<category domain="http://example.com/">Category 2</category>
</item>
</channel>
</rss>