An identifier can contain one or several attributes. You can add these attributes to an identifier to further characterize the identifier.
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Select an identifier from the List of Identifiers or the Identifiers tab in the property sheet of a class, and click the Properties tool to display its property sheet.
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Click the Attributes tab and click the Add Attributes tool to display the list of attributes for the class.
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Select the check boxes for the attributes you want to add to the identifier.
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Click OK in each of the dialog boxes.