MXML is a historical xml format created in 2004.

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Example code from Wikipedia:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" 
                layout="absolute" backgroundGradientColors="[#000011, #333333]">
   <mx:Label text="Hello World!" verticalCenter="0" horizontalCenter="0" fontSize="48" letterSpacing="1">
      <mx:filters>
         <mx:GlowFilter color="#ffffdd"/>
      </mx:filters>
   </mx:Label>
</mx:Application>
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Last updated February 11th, 2019