Chapter 3 Building Conceptual Data Models

Specifying an attribute as mandatory

If an attribute is mandatory, every object occurrence must have a value for that attribute. Identifiers (see Identifiers (CDM)) are always mandatory.

To define an attribute as mandatory:

1. Open the attribute's property sheet and click the Attributes tab.
2. Select the Mandatory check box at the bottom of the dialog box and click Ok to return to the model.

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