# Atom 1.0

Source: https://xmlvalid.com/schemas/atom-1.0

> Blog, podcast and changelog feeds in the Atom format, as read by feed readers and aggregators.

Atom is the IETF standard for web feeds (RFC 4287). Its schema is published in the RFC itself, in the RelaxNG compact syntax; xmlvalid.com translates it to the XML syntax before validating.

- Type: RelaxNG Compact
- Version: RFC 4287
- Namespace: `http://www.w3.org/2005/Atom`
- Root element: `feed, entry`
- Publisher: IETF (IETF Trust Legal Provisions (code components)), source: https://www.rfc-editor.org/rfc/rfc4287#appendix-B
- Validate against it: https://xmlvalid.com/validate?schema=atom-1.0

## Notes

- The schema is informative: the RFC text is normative. Two rules are written in Schematron and not applied: a feed needs an author unless every entry has one, and an entry needs an alternate link or content.
- Extension elements in other namespaces are accepted without being checked.