What are the limitations of DTD?

Related questions

1. Is doctype needed?
2. Is doctype declaration necessary?
3. Is doctype mandatory?
4. What are the disadvantages of XML?
5. What if we dont use doctype in HTML?
6. What is the meaning of <! Doctype html?
7. Why is doctype needed?
8. What happens if doctype is not specified?
9. What does the doctype declaration tell the browser being used?
10. What is DTD in xhtml?

Tags

1. #names
2. #string
3. #defined
4. #purpose
5. #namespace
6. #element
7. #assigned
8. #using
9. #object
10. #oriented
11. #within
12. #disadvantages
13. #namespaces
14. #violates
15. #however
16. #attribute
17. #groups
18. #supports
19. #which
20. #mechanism