Active Directory Schemas
Like a database, a directory tree must conform to a specific schema. Its schema dictates which types of objects are in the directory and which attributes they can have. Because Active Directory encapsulates its schema in directory objects, they can be treated in the same way you treat the other objects in the directory. This means that the schema is inherently extensible: Just add a new object with a new set of attributes, and you have effectively extended that directory's schema.
Note
In Microsoft's Active Directory, the class responsible for schema definitions is called schemaClass.
Classes
Your knowledge of classes from earlier discussions in this book can be put to good use with directory service programming as well. ...
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