What is Xquery used for in XML file?

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Tags

1. #source
2. #contains
3. #databases
4. #means
5. #manipulate
6. #specific
7. #office
8. #relational
9. #syntax
10. #viewed
11. #parts
12. #xpath
13. #expression
14. #superset
15. #documents
16. #xquery
17. #document
18. #extract
19. #address
20. #provides