Unused categories

The following category pages exist, although no other page or category makes use of them.

Showing below up to 20 results in range #1 to #20.

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1. Accessibility
2. Bibliographic
3. Developer Tools
4. Development/Languages
5. Documentation/Developer
6. ESC
7. Extensions
8. Features
9. File formats
10. Hack
11. Helper
12. I18n
13. Implementation
14. Metadata
15. Modularization
16. Notes2
17. PIM
18. Packaging
19. Policy
20. RU/Documentation/Usage

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