What is DTD and its types?

Related questions

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7. What is DTD file?
8. What is external DTD?
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Tags

1. #markup
2. #validated
3. #structure
4. #valid
5. #define
6. #elements
7. #blocks
8. #document
9. #family
10. #building
11. #defines
12. #language
13. #attributes
14. #declarations
15. #definition