XML markup languages, aka XML markup languages, is an actively used metalanguage created in 1996.

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Example code from Linguist:

<?xml version="1.0"?>
<gml:Point xmlns:gml="http://www.opengis.net/gml" srsName="urn:ogc:def:crs:EPSG::4326" gml:id="uuid.12b3c8bb-bc8a-4f83-9085-1a5f3280b8ba">
  <gml:pos>52.56 13.29</gml:pos>
</gml:Point>

Example code from Wikipedia:

<?xml version="1.0" encoding="ISO-8859-1" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"></xs:schema>
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Last updated February 11th, 2019