XML (Extensible Markup Language) is a set of rules for encoding documents in both human-readable and machine-readable form. Use this tag for security issues relating to the format itself, or where the fact that the data is xml-formatted is core to the question.

XML (Extensible Markup Language) is a set of rules for encoding documents in both human-readable and machine-readable form.

It is defined in the XML 1.0 Specification produced by the W3C, and several other related specifications, all gratis open standards.

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