Web Table 2: Supported Schema Operations on attributeSchema Objects
Attribute	Function	Mandatory	Reusable in Win2K	Reusable in Windows 2003	Comment
cn	Contains the object’s common name	Yes	No; the cn must be unique and can’t be renamed in Win2K	Yes, in Windows Server 2003 forest functional level and only if the old attributeSchema object’s cn is renamed	Any attributeSchema object should use a unique cn in the Schema NC.
lDAPDisplayName	Defines the LDAP display name of the attribute	Yes	Yes, if the old lDAPDisplayName is renamed and only for Category 2 objects (a schema extension always creates Category 2 schema objects)	Yes, for Category 2 objects only; in non–Windows Server 2003 forest mode, if you plan to recreate an attributeSchema object using the same lDAPDisplayName, you must change the lDAPDisplayName of the old schema object before deactivating it. No restrictions for Windows 2003 running in forest mode.	Any new schema object must use a unique lDAPDisplayName.
isSingleValued	Determines whether an attribute is single-valued or multi-valued	Yes	Yes	Yes	The value can only be set during the attributeSchema creation.
oMSyntax, attributeSyntax	Define the attribute's syntax (i.e., string or numeric)	Yes	Yes	Yes	The value defined can only be set during the attributeSchema creation.
rangeLower, rangeUpper	Determines the minimum and maximum length (for a string) or value (for a number) of the defined attribute	No	Yes	Yes	The value defined can be changed after the attributeSchema creation.
searchFlags	Determines whether the attributeSchema object is indexed	No	Yes	Yes	The value defined can be changed after the attributeSchema creation.
isMemberOfPartial AttributeSet	Determines whether the attribute is published in the GC	No	Yes, but the addition of an attribute to the GC (also called the partial attribute set) recreates all GCs in the forest, which might involve a huge amount of replication traffic	Yes	The value defined can be changed after the attributeSchema creation.
attributeID	Contains the OID	Yes	No even if the attributeSchema object is deactivated	Yes in Windows Server 2003 forest mode only if the old attributeSchema object is deactivated	Any attributeSchema object must use a unique OID.