RSS Board says to use Dublin Core&#x27;s dcterms:valid in their MRSS spec: <a href="http:&#x2F;&#x2F;www.rssboard.org&#x2F;media-rss" rel="nofollow">http:&#x2F;&#x2F;www.rssboard.org&#x2F;media-rss</a><p>To hide an article you expire it right away. Numerous video platforms support this tag (youtube, thePlatform, dailymotion).<p><a href="http:&#x2F;&#x2F;dublincore.org&#x2F;documents&#x2F;dcmi-terms&#x2F;" rel="nofollow">http:&#x2F;&#x2F;dublincore.org&#x2F;documents&#x2F;dcmi-terms&#x2F;</a><p>I&#x27;m not sure why it isnt in the RSS spec, but I wonder if any CMS&#x27;s still support it in the text world.