What is the alternative for XML and what are its advantages over XML?

Related questions

1. What is valid XML document?
2. What is DTD XML?
3. What is XML schema used for?
4. What is the main use of XML?
5. What is an XML schema file?
6. Can white spaces can be preserved by XML?
7. What are advantages of XML?
8. Why XML is needed?
9. Why do we use XML schema?
10. What does XML do?

Tags

1. #programming
2. #smaller
3. #structures
4. #extensibility
5. #grammar
6. #directly
7. #modern
8. #simpler
9. #simplicity
10. #languages
11. #because
12. #extensible