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Electronic Documents Markup
A brief explanation of what markup languages are and where they come from. (infos)Project Xanadu
The original hypertext project. Includes a history of the project and gives credit to the early developers of markup languages. (infos)
whatis.com: markup
A short definition. (infos)
YAML Ain't Markup Language (YAML)
A straightforward machine parsable data serialization format designed for human readability and interaction with scripting languages such as Perl and Python. (infos)