Atom’s required id element eliminates the guesswork that plagues RSS’s optional guid, making web feeds more reliable for both clients and publishers.

The split is stark: about 75 % of the feeds the author follows are RSS, while the remaining 25 % are Atom. The two specifications together cover roughly 99 % of all web‑feed formats in use today. Yet the optional natu…

Atom was drafted as a direct response to RSS’s “flawed and ambiguous” design. Its XML schema mandates an id element for every entry, giving feed authors a clear, enforceable way to tag items uniquely. If a publisher o…

The requirement also simplifies client logic. Because every Atom entry carries a guaranteed identifier, parsers can skip heuristic matching and focus on delivering content. Developers building readers like Elfeed repo…