The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- AnnotationProperty (8 members)
- Category (Class) (3 members)
- Data property (20 members)
- Entity (2 members)
- Imported vocabulary (8 members)
- Item (18 members)
- OSL/Infrastructure/Template/User (11 members)
- Host (0 members)
- Country (0 members)
- Chemical substance (1 member)
- Remote File (1 member)
- Building function (0 members)
- Keyword (1 member)
- Strict Participants Process Type (1 member)
- Shipment (0 members)
- Dataset schema (0 members)
- Event with People (4 members)
- Laboratory process (2 members)
- Wiki File (23 members)
- University (0 members)
- Administrative Area (4 members)
- Data Device (0 members)
- Material Type (2 members)
- Organization (5 members)
- Administrative process (0 members)
- Main Quantity Property (9 members)
- Data software (0 members)
- Sample type (0 members)
- Grant (1 member)
- Place (1 member)
- Mixing process (1 member)
- Geo Sample (0 members)
- Data (2 members)
- Chemical Substance Type (0 members)
- Status Enumeration (4 members)
- Page Package (2 members)
- Material (1 member)
- Data term (2 members)
- OwlThing (0 members)
- Physical Item (3 members)
- Organizational unit (2 members)
- Location (4 members)
- Local File (0 members)
- Goverment Organization (0 members)
- Person (2 members)
- Site (0 members)
- Project (Application) Status (13 members)
- Tutorial (14 members)
- Building (0 members)
- Function (4 members)