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by webmaven 2730 days ago
> (O'Reilly's books were famously typeset with Troff/Groff for many years, though I don't know how painful that was or how advanced their typesetting needs were.)

I beleive that O'Reilly Media has used ASCIIDoc[0] as their preferred internal format for quite a few years. Formulas are supported through ASCIIMthML[1].

More recently, they seem to have transitioned to HTMLBook[2] as a preferred source format for systems like Atlas[3].

[0] ASCIIDoc is basically a Markdown-like (or ReStructuredText-like) format that is feature-equivalent to DocBook XML: http://asciidoc.org/

[1] http://asciidoc.org/asciimathml.html

[2] http://oreillymedia.github.io/HTMLBook/

[3] https://atlas.oreilly.com/