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  1. XML Tutorial - W3Schools

  2. XML - Wikipedia

  3. XML introduction - XML: Extensible Markup Language | MDN

  4. What Is An XML File (And How Do I Open One)? - How-To Geek

  5. XML Introduction - W3Schools

  6. What Is an XML File? (And How to Open One) - Lifewire

  7. Extensible Markup Language (XML) - World Wide Web …

  8. What is XML - W3Schools

  9. What is XML - GeeksforGeeks

  10. What is XML? | Opensource.com