XML namespace
Atom Syndication Format 1.0
The namespace for Atom feeds, and for the <atom:link rel="self"> element that well-formed RSS feeds borrow to point at their own URL.
xmlns:atom="http://www.w3.org/2005/Atom"Atom is namespaced from the start, unlike RSS 2.0. A feed document's root <feed> element carries this URI, usually as the default namespace, and every child element belongs to it.
You will also meet this namespace inside RSS: the convention for a feed to point at its own canonical URL is to import Atom and use <atom:link rel="self">, because RSS 2.0 has no element of its own for the job.
- URI
http://www.w3.org/2005/Atom- Prefix
atom- Elements
feedentryidtitleupdatedlinkauthorcontent
Specification: RFC 4287
Formats that use it
RSS 2.0
<rss>The most widely deployed syndication format: namespace-free at its core, extension-heavy in practice, and unopinionated about almost everything.
Atom 1.0
<feed>The IETF-standardised syndication format: namespaced from the root, strictly typed, and unambiguous about dates in a way RSS 2.0 never was.
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