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XML Tutorial - W3Schools
XML - Wikipedia
XML за начинаещите - Поддръжка на Microsoft
XML introduction - XML: Extensible Markup Language | MDN
XML Introduction - W3Schools
Extensible Markup Language (XML) - World Wide Web …
XML: Extensible Markup Language | MDN - MDN Web Docs
What is XML ? - GeeksforGeeks
XML | Basics - GeeksforGeeks
A Really, Really, Really Good Introduction to XML — SitePoint