| Attribute | Must | Description |
|---|---|---|
| Auxiliary-Class | Classes from which attributes are inherited. | |
| Common-Name | X | RDN string for DSA use only, e.g. "Class 2-5-5-3" |
| Governs-ID | X | The class of object that this record governs |
| LDAP-Display-Name | LDAP display Name for the object class | |
| MAPI-Display-Type | The MAPI Display Type of the object class e.g. User, DL, Folder | |
| May-Contain | A list of optional attributes for this class (OIDs) | |
| Must-Contain | A list of required attributes for this class (OIDs) | |
| Object-Class-Category | X | 0=88 Class, 1=Abstruct Class, 2=Structural Class & 3=Auxiliary Class |
| Poss-Superiors | The list of possible superior object classes defining DIT structure | |
| RDN-Att-ID | X | The naming attribute for this class (OID) |
| Schema-Flags | The flags for the object class (replicate to other site or not etc.) | |
| Sub-Class-Of | X | The parent obj class of the governsId class |