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eXtensible Markup Language (XML)

Definitions:

  A cross-platform, extensible, and text-based standard markup language for representing structured data. It provides a cross-platform, software- and hardware-independent tool for transmitting information.
Sources:
NIST SP 800-95 under Extensible Markup Language (XML) from World Wide Web Consortium (W3C): Extensible Markup Language (XML)

  a flexible text format designed to describe data for electronic publishing.
Sources:
NISTIR 7250 under Extensible Markup Language
NISTIR 7387 under Extensible Markup Language