Sybase Powerdesigner 7.5, Руководство пользователя

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Defining interfaces
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You can add the following objects to an interface:
Object Description
Attribute Named property of an interface that defines the characteristics of
an interface
Operation Implementation of a service that can be requested from any
object of the interface in order to affect behavior
Business rule Written statement specifying what the information system must
do or how it must be structured to support business needs
You add an object to an interface from the list in the page corresponding to
the object, in the interface property sheet.
When you add an object to an interface in this way, you in fact create a copy
of the object. The new object exists as a unique object, and you can then
make changes to it as you would to any object in the model.
Adding an attribute to an interface
An attribute is a named property of an object that defines the characteristics
of the object.
You can add attributes to an interface that already exist in the model and
which belong to other objects.
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To add an attribute to an interface:
1 Double-click an interface in the model.
The interface property sheet appears.
2 Click the Attributes tab.