What is XML schema used for?

Related questions

1. Why do we use XML schema?
2. What is the real use of XML?
3. What are advantages of XML?
4. What is XML formatting?
5. What are XML files used for?
6. What is valid XML document?
7. Where XML is used in applications?
8. What is indent XML?
9. Why XML is needed?
10. What is the alternative for XML and what are its advantages over XML?

Tags

1. #element
2. #elements
3. #definition
4. #commonly
5. #content
6. #attributes
7. #known
8. #defines
9. #validate
10. #schema
11. #supports
12. #namespaces
13. #describe
14. #structure
15. #types