Sun Directory Services provides a schema checking feature. When directory information is added or modified, the directory server checks that all mandatory attributes of the object class or inherited by the object class are present.
The schema checking options are:
Off: no checking is performed
Weak: a check is performed when entries are created or modified
Strong: in addition to the previous level, a check is performed on search operations
Select the appropriate level of checking from the Schema check menu button in the Schema section of the Admin Console. The default level of checking is weak.
Schema checking cannot be performed on the compatibility of object classes. For example, you could create an entry with the device object class and the person object class. The IETF standards do not enforce rules on object classes.