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It's true that many of the people who use Emacs are developers, writing code, tweaking it, recompiling it, and just generally enjoying the services of an amazingly extensible work environment. A variety of people, including developers, need to produce text for publication, whether internally, online, or in book format. This chapter describes the markup language support that Emacs offers, a topic relevant to both information publishers and developers, as more and more development work uses variants of the Extensible Markup Language, XML.
Choosing a format for producing documents isn't all that straightforward these days, especially if you eschew Microsoft Word. Some people write HTML, and Emacs offers a few options for this. HTML gives you some control over formatting but displays differently on various browsers. Of course, it is important as the lingua franca of the Web.