V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

XML
       eXtensible Markup Language (WWW, XML, W3C)


The Free On-line Dictionary of Computing (30 December 2018):

Extensible Markup Language
XML

    (XML) An initiative from the W3C defining
   an "extremely simple" dialect of SGML suitable for use on
   the web.

   (http://w3.org/XML/).

   [Relationship to the XSL forthcoming subset of DSSSL?]

   (1997-11-20)