RSS - Wikipedia
https://en.wikipedia.org/wiki/RSS
RSS (RDF Site Summary or Really Simple Syndication) is a web feed that allows users and applications to access updates to websites in a standardized, computer-readable format.
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The RSS feed markup. Turbo pages
https://yandex.com/dev/turbo/doc/rss/markup.html
The RSS feed structure. Sending the page content. Characters and encodings. If the RSS file is passed in KOI8-R, replace the Windows-1251 characters in the text with their KOI8-R analogs