RSS, MusicXML, SVG, Docbook, Epub, JATS, XMP, ... Sorry, web frontend is not the "whole XML tech stack", despite popular belief. And yes all of the above are

RSS, MusicXML, SVG, Docbook, Epub, JATS, XMP, ... Sorry, web frontend is not the "whole XML tech stack", despite popular belief. And yes all of the above are mainstream in their respective industry.