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- The Active Directory schema contains the definitions for all objects in the directory. Every new directory object created is validated against the appropriate object definition in the schema before being written to the directory. The schema is made up of object classes and attributes. The base (or default) schema contains a rich set of object classes and attributes to meet the needs of most organizations, and is modeled after the International Standards Organization (ISO) X.500 standard for directory services. Because it is extensible, you can modify and add classes and attributes to the base schema. See also: X.500
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- The definition of an entire database; the universe of objects that can be stored in the directory is defined in the schema. For each object class, the schema defines what attributes an instance of the class must have, what additional attributes it may have, and what object class can be a parent of the current object base. See also object, attribute.
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- Database structure
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- Attribute, Attributes, Classes, Globally Unique Identifier (GUID), GUID, Object, Object identifier (OID), X.500