What is doctype in XML?

Related questions

1. What is doctype declaration in html5?
2. What is doctype html?
3. What DTD means?
4. What is the difference between HTML and html5?
5. How can we create doctype in html5?
6. Why doctype is used in XML?
7. What is doctype and what happens if doctype is not declared in a document?
8. What is doctype XML?
9. How do you know which HTML version I am using?
10. What does doctype mean?

Tags

1. #combination
2. #doctype
3. #consists
4. #defines
5. #document
6. #references
7. #constraints
8. #definition
9. #structure
10. #external
11. #internal
12. #declaration