### The GDS Standard Schema

When the DCE software package is shipped to a customer, it includes a default or standard schema for GDS. This is the GDS proprietary interpretation of the X.500 schema.

Each attribute in the schema is assigned a unique object identifier and the syntax of its value. In addition, the schema specifies the mechanism by which attributes of this type are compared with one another. Each entry in the DIT belongs to an object class governed by the schema. Object class definitions can be used to derive subclasses, supporting the inheritance and refinement of the attribute types defined for the superclass.

Included with the GDS standard schema are the following tables that define the structure of the directory:

· Structure Rule Table (SRT)

· Object Class Table (OCT)

· Attribute table (AT)

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