How to validate an RSS 2.0 feed
To validate an RSS feed, you must include the following XML Schema in the RSS feed: http://www.thearchitect.co.uk/schemas/rss-2_0.xsd. Once you've included this schema in your RSS feed, XMLBlueprint XML Editor will support XML Completion for your RSS document. To validate your RSS feed, open it in XMLBlueprint XML Editor and click XML > Validate.
To use this XML Schema, start your RSS feed with:
<rss version="2.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="http://www.thearchitect.co.uk/schemas/rss-2_0.xsd">
<channel>
...
...
</channel>
</rss>
