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XML - Wikipedia
XML Tutorial - W3Schools
XML introduction - XML: Extensible Markup Language | MDN
XML Introduction - W3Schools
XML | Basics - GeeksforGeeks
Extensible Markup Language (XML) - World Wide Web …
A Really, Really, Really Good Introduction to XML — SitePoint
What is XML? | Opensource.com
What Is XML Used For? - Codecademy
What Is XML? (Definition, How It Works, vs. HTML) | Built In