Schema classes and attributes
Every directory object you create is an instance of an object class contained in the schema. Each object class contains a list of associated attributes that determine the information the object can contain. Classes and attributes are defined independently, so that a single attribute can be associated with multiple classes. All schema classes and attributes are defined by the classSchema and attributeSchema objects, respectively.
ClassSchema objects are used to define classes in the schema. A classSchema object provides the template for building directory objects of that class. Examples of classSchema include User and Server. A classSchema object contains, among other things, the following information:
Class type (structural, abstract, or auxiliary)
Common name and Lightweight Directory Access Protocol (LDAP) display name
Lists of the "must contain" and "may contain" attributes for instances of the object
Relative distinguished name attribute
A list of possible parent classes
Three different types of classes exist in the schema:Class type Purpose
Used to instantiate objects (users, servers and so on) in the directory.
Provides templates for deriving structural classes
Contains predefined lists of attributes that can be included in structural and abstract classes
AttributeSchema objects are used to define attributes in the schema. An attributeSchema object determines the allowable contents and syntax for instances of that attribute in the directory. Examples of attributeSchema include User-Principal-Name and Telex-Number. An attributeSchema object contains, among other things, the following information:•
Common name and LDAP display name
Data constraints (single versus multivalued, minimum, and maximum values)
Whether and how the attribute is indexed
Jul 17, 2008 |
Microsoft Windows Server Standard 2003 for...