Subset of SGML.
Extensible Markup Language
A language for marking up information, usually used for interchange between programs and for file formats. Marginally human readable and editable, but mostly designed for computer generation and reading.
Uses a DTD to describe the data within the XML document.
Yet Another Three Letter Acronym
41 pages link to XML:
lib/main.php:944: Notice: PageInfo: Cannot find action page
lib/main.php:839: Notice: PageInfo: Unknown action