What is DTD how is it different from XML?

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Tags

1. #namespaces
2. #allow
3. #between
4. #schema
5. #written
6. #datatypes
7. #while
8. #elements
9. #define
10. #include
11. #differences
12. #schemas
13. #definition
14. #document
15. #doesn
16. #derived
17. #attributes
18. #syntax
19. #support