What is XML document validation?

Related questions

1. How many types of DTD are there in XML?
2. What is XML mapping?
3. What is an XML schema used for?
4. What is XML DocType?
5. Why is DTD important?
6. What is DTD Why do we use it?
7. What is use of DTD in XML?
8. Why do we need XML parser?
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Tags

1. #which
2. #valid
3. #documents
4. #document
5. #formed
6. #checking
7. #structure
8. #markup
9. #process
10. #validation
11. #confirm
12. #defined
13. #written
14. #language
15. #extensible
16. #rules
17. #follows
18. #syntactic
19. #basic