This feed does not validate.
In addition, interoperability with the widest range of feed readers could be improved by implementing the following recommendation.
<?xml version="1.0"?>
<?xml-stylesheet title="CSS_formatting" type="text/css" href="./rss_moved.css"?>
<rss version="2.0" xmlns:sy="http://purl.org/rss/1.0/modules/syndication/">
<channel><link>http://interglacial.com/rss/#moved</link>
<title>Cake</title>
<description>This feed has moved!</description>
<language>en-US</language>
<lastBuildDate>Fri, 1 May 2020 00:01:00 GMT</lastBuildDate>
<sy:updateFrequency>1</sy:updateFrequency>
<sy:updatePeriod>weekly</sy:updatePeriod>
<sy:updateBase>2010-01-01T00:00+00:00</sy:updateBase>
<docs>http://interglacial.com/d/about_rss/1week#_yes_this_means_YOU</docs>
<ttl>10080</ttl>
<webMaster>sburke@cpan.org (Sean M. Burke)</webMaster>
<item>
<title>This feed has moved</title>
<guid >http://interglacial.com/rss/Cake#moved</guid >
<link>CAKE's Feed Moved</link>
<description>Update your feedreader: this feed has now moved to
XxXxxXxXxXXxXXxXXXXxXX
</description></item></channel></rss>