eXtensible Mark-up Language
A version of SGML, designed for use on the Internet.
"a meta-language used to define customised mark-up language. Designed to enable computer applications to use and re-use elements of documents. Used to define the structure of the document." - Gilchrist, Alan (2002) "From Aristotle to the 'semantic web'", LA Record January 2001 vol 104(1).
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