Show all Use classes
- id: 10
- name: Active recreation
- Show all Activities
  - Link
    - id: 7
    - activity: Motor sports on water
    - use_class: Active recreation
  - id: 19
  - name: Motor sports on water
  - ordr: 43
  - Pressures
    - Motor sports on water -> Underwater noise

Schema set = . User = guest.