To Create a Primary Identifier when You Create the Class Attributes:
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Double-click a class in the diagram to display its property sheet, and then click the Attributes tab.
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Double-click an attribute in the list to display its property sheet, and then click the Detail tab.
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Select the Primary Identifier check box and click OK to return to the Attributes tab of the class property sheet.
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Click the Identifiers tab to view the new identifier in the list.
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Click OK.