Item Details

Common Name

The relative distinguished name of the class instance.

X.500 OID

The object identifier (also known as OID), which is issued by the International Standards Organization (ISO) and guaranteed to be unique across all networks worldwide. Object identifiers ensure that classes or attributes that are defined by different entities do not conflict when various directory services, such as Active Directory Domain Services (AD DS), are brought together into a global directory.

Class Type

The selected class can be one of three types:

  • Structural: The class can be instantiated in the directory.

  • Abstract: The class provides a basic definition of a class that can be used to form structural classes.

  • Auxiliary: The class can be used to extend the definition of a class that inherits from it, but it cannot be used to form a class by itself.


The name of this class that is used by the Lightweight Directory Access Protocol (LDAP) agent for AD DS. LDAP clients must use this name to access objects of this class.


Click to change the default objectCategory of the selected class. This button is disabled for objects that are marked as “base schema”.

Show objects of this class while browsing

Select to control the defaultHidingValue attribute on the class. This attribute controls the default value of the showInAdvancedViewOnly attribute on newly created objects of the class.

Class is active

Click to deactivate the class if it is active.

You can use deactivation to recover the class; deletion is permanent. When a class is deactivated, you can no longer create objects that are instances of that class. A deactivated class still exists in the directory. Therefore, you cannot create new classes with the same name.

If this check box is unavailable, the class is in the base schema and AD DS requires that it remain active. The class cannot be deactivated.

Additional references