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X is for eXtensible

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Extensible Markup Language (XML)
Extensible Markup Language (XML) is a markup language and file format for storing, transmitting, and reconstructing arbitrary data.
It defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. The XML 1.0 Specification formalized by the W3C in 1998 and several other related specifications — all of them free open standards — defines XML.
See also JSON.
Source: XML

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