A language that annotates or structures document text using explicit tags, elements or declarative syntax, rather than expressing executable step-by-step computation; not Turing-complete in the general-purpose-programming sense. Markup languages are filed within this atlas's existing language type rather than a separate type, and are told apart by their sub label like every other language member. Belongs here: HTML, XML, Markdown and SGML, the metalanguage both HTML and XML derive their own design principles from. Does not belong here: a Turing-complete general-purpose or scripting programming language, filed under one of the atlas's existing paradigm-classification subcategories, or a language whose primary purpose is representing structured data for machine interchange rather than marking up document text, filed under Data Serialization Format.
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Sources
1. Wikipedia: Markup language
WikipediaMarkup language, Scribe GML SGML sectionQuote, Markup language, Scribe GML SGML section
Goldfarb developed the basic idea while working on a primitive document management system intended for law firms in 1969, and helped invent IBM's Generalized Markup Language (GML) later that same year.
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