The schema defines what will become an NDS object (such as users, printers and groups) and which information is required or optional at the time that NDS object is created. Every NDS object has a schema class that has been defined for that type of object.
The schema that originally shipped with the product is called the base schema.
Once the base schema has been modified in any way--such as adding a new class or a new attribute, then it is considered the extended schema.
You don't need to extend the schema, but you now have the ability to do so. The Schema Manager utility allows the schema to be extended as needed to meet organizational needs. For example, you may want to extend your schema if your organization requires special footwear for employees and you need to keep track of employee shoe sizes. You might want to create a new attribute called Shoe Size and then add it to the User class.
Use this utility to extend the schema. It is available from the Object menu in the NDS ManagerTM utility after you select a partition.
For more information on Schema Manager, see Understanding Schema Manager.