Element Comparison Table Atom 1.0 defines 21 elements; RSS 2.0, 30. Most of the RSS 2.0 elements missing in Atom 1.0 are either those that were never widely implemented in practice, or the capabilities are provided in other ways. RSS 2.0 Atom 1.0 Comments rss - Vestigial in RSS channel feed title title link link Atom defines an extensible family of rel values description subtitle language - Atom uses standard xml:lang attribute copyright rights webMaster - managingEditor author or contributor pubDate published (in entry) Atom has no feed-level equivalent lastBuildDate (in channel) updated RSS has no item-level equivalent category category generator generator docs - cloud - ttl - ttl is problematic, prefer HTTP 1.1 cache control image logo Atom recommends 2:1 aspect ratio - icon As in favicon.ico rating - textInput - skipHours - skipDays - item entry author author - contributor description summary and/or content depending on whether full content is provided comments - enclosure - rel="enclosure" on link in Atom guid id source - rel="via" on link in Atom - source Container for feed-level metadata to support aggregation Related See also: Atom Syndication Format - Introduction

Element Comparison Table Atom 1.0 defines 21 elements; RSS 2.0, 30. Most of the RSS 2.0 elements missing in Atom 1.0 are either those that were never widely implemented in practice, or the capabilities are provided in other ways. RSS 2.0 Atom 1.0 Comments rss - Vestigial in RSS channel feed title title link link Atom defines an extensible family of rel values description subtitle language - Atom uses standard xml:lang attribute copyright rights webMaster - managingEditor author or contributor pubDate published (in entry) Atom has no feed-level equivalent lastBuildDate (in channel) updated RSS has no item-level equivalent category category generator generator docs - cloud - ttl - ttl is problematic, prefer HTTP 1.1 cache control image logo Atom recommends 2:1 aspect ratio - icon As in favicon.ico rating - textInput - skipHours - skipDays - item entry author author - contributor description summary and/or content depending on whether full content is provided comments - enclosure - rel="enclosure" on link in Atom guid id source - rel="via" on link in Atom - source Container for feed-level metadata to support aggregation Related See also: Atom Syndication Format - Introduction