Why is XML used for document standards?

Related questions

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

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1. #generalized
2. #derived
3. #variety
4. #xhtml
5. #features
6. #makes
7. #versatile
8. #however
9. #document
10. #finds
11. #hundreds
12. #create
13. #standard
14. #including
15. #markup
16. #application
17. #wider
18. #language
19. #formats