Extensible Markup Language (XML)<p>In computing, Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. The W3C's XML 1.0 Specification and several other related specifications—all of them free open standards—define XML</p> <p>See also: <a href="https://en.wikipedia.org/wiki/XML">XML</a></p>