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W3C Feed Validation Service, for Atom and RSS
RSS Validator
RSS Lookup - Find RSS feeds on any URL
Feed Validator for Atom and RSS
RSS feed checker - RSS Feed Expert
Easily find RSS Feeds by keywords or URL with RSS Finder
The Best RSS Feed Validators to Use - RSS.app
RSS Feed Validators
About the W3C Feed Validation Service
RSS 2.0 specification - W3
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