The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- AnnotationProperty (7 members)
- CategoryClass (1 member)
- DataProperty (15 members)
- Entity (2 members)
- Imported vocabulary (8 members)
- Item (14 members)
- OSL/Infrastructure/Template/User (11 members)
- OSLae92be81cdb34d22844d4791ef790d93 (0 members)
- Host (0 members)
- Country (0 members)
- ChemicalCompound (1 member)
- RemoteFile (1 member)
- BuildingFunction (0 members)
- Keyword (0 members)
- Event (0 members)
- ElnEntry (0 members)
- WikiFile (23 members)
- University (0 members)
- AdministrativeArea (4 members)
- Organization (5 members)
- AdministrativeProcess (1 member)
- MainQuantityProperty (8 members)
- Grant (1 member)
- Place (1 member)
- GeoSample (0 members)
- Data (2 members)
- StatusEnumeration (2 members)
- Material (2 members)
- PhysicalItem (0 members)
- RiskAssessmentProcess (0 members)
- OrganizationalUnit (2 members)
- Location (4 members)
- LocalFile (0 members)
- GovermentOrganization (0 members)
- Person (2 members)
- Site (0 members)
- ProjectStatus (1 member)
- Tutorial (13 members)
- Building (0 members)
- Function (4 members)
- Institute (0 members)
- BudgetType (0 members)
- Topic (0 members)
- Competence (0 members)
- PersonRole (0 members)
- Corporation (0 members)
- Priority (3 members)
- SubQuantityProperty (3 members)
- Floor (0 members)
- CreativeWork (2 members)