What is the requirement of XML schema?

Related questions

1. What is a valid document in XML?
2. What language is used for defining XML schema?
3. What is the difference between well formed XML and valid XML?
4. What is the use of namespace in XML?
5. What is XML schema file?
6. What is well formed and valid XML document?
7. What is XML Schema instance?
8. What is XML document structure?
9. Why is XML used for document standards?
10. Is XML well formed?

Tags

1. #import
2. #define
3. #typing
4. #relational
5. #adequate
6. #primitive
7. #object
8. #language
9. #schema
10. #provide
11. #types
12. #requirements
13. #systems
14. #integer
15. #sequence
16. #including
17. #system
18. #database
19. #datatype
20. #export