PowerDesigner supports the Java 5.0 built-in annotations, the .NET 2.0 built-in custom attributes and for both Java 5.0 and .NET 2.0, also allows you to create your own. You can attach annotations to types and other model objects:
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Double-click a class or other object to open its property sheet, and then click the Annotations tab.
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Click in the Annotation Name column, and select an annotation from the list.

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If the annotation takes parameters, you can enter them directly in the Annotation Text column or click the ellipsis button to open the Annotation Editor.
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[optional] Click the Preview tab to see the code that will be generated for the class, with its declaration preceded by the annotation:

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Click OK to return to the diagram.