Can I use XML instead of HTML?

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Tags

1. #accessible
2. #specific
3. #files
4. #instead
5. #manufacturers
6. #because
7. #document
8. #markup
9. #flexible
10. #being
11. #reusable
12. #restricted
13. #become
14. #software
15. #information
16. #publishing
17. #handling
18. #existing
19. #environments
20. #becomes
21. #outside