This classes diagram represents the main relations that exist between every classes of the directory system.

| Functional term | Technical term | SDK term | JDO term | Description |
| Organization | Organization | IOrganization | Organization | Organization/Structure |
| Group | Group | IGroup | Group | Group of people |
| User | User | IUser | User | Portal user |
| Localization | Localization | ILocalization | Localization | Place or geographical situation Examples: building,floor,office |
| Extended attributes | Extended attributes | Attributes | IAttributes | Directory extended attributes |