What are the three main types of XML documents?

Related questions

1. Why is XML used for document standards?
2. What is XML Schema instance?
3. What is the difference between well formed XML and valid XML?
4. What is XML DTD explain?
5. What is the use of namespace in XML?
6. What is XML Schema and DTD explain XML schema example?
7. What is a valid document in XML?
8. What is well formed and valid XML document?
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1. #three
2. #documents
3. #hybrid
4. #valid
5. #based
6. #distinction
7. #centric
8. #different
9. #formed
10. #following
11. #categorizing
12. #include
13. #between
14. #perspective
15. #document
16. #types
17. #combination