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An international standard metalanguage for creating markup languages that structure digital information in a way that allows for the exchange, display, and storage of data independent of proprietary operating systems and hardware devices.
[Ex(tensible) M(arkup) L(anguage).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Computer Science) extensible markup language: a computer language used in text formatting
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
eXtensible Markup Language: a simplified version of SGML that can be used, esp. on the Web, to create a tagging scheme that allows elements of a document to be marked according to their content rather than their format.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.