Double-click a class in the diagram to display its property sheet.
To attach a classifier to an attribute data type, click the Attributes tab, select an attribute in the list, and click the Properties tool to open the attribute property sheet.
To attach a classifier to an operation return type, click the Operations tab, select an operation in the list, and click the Properties tool to open the operation property sheet.
To attach a classifier to an operation parameter data type, click the Operations tab, select an operation in the list, and click the Properties tool to open the operation property sheet. Then click the Parameters tab, select a parameter in the list, and click the Properties tool to open the parameter property sheet
Click the Select a Classifier button beside the Data type listbox to open the Selection window. This window contains a list of all the classifiers in the model.
Select the classifier to be attached and click OK to return to the property sheet. The classifier name is now displayed in the Data type list.
Click OK.
Note:
When you select a data type that matches the code of a classifier, the data type is automatically synchronized if the code of the classifier changes.