Select the Add command from the Interfaces menu.
The Define Interface dialog, shown in the following example, is then displayed.
In the Name text box, specify the name of the interface that you want to define. The name must be unique within the schema to which it is being added.
If you want the interface to extend any existing interface that exists in the current schema or superschema, select one or more interfaces that you want to extend from the list displayed in the Extends list box. As no interface is extended by default, the < none > value is selected by default.
As an interface can extend multiple other interfaces, you can select multiple interfaces in the Extends list, if required, by using the Ctrl key and clicking each interface that you want to extend.
If you want to enter free-format descriptive text for the interface, select the Text sheet. The Define Interface dialog Text sheet is then displayed.
In the editor pane, enter the descriptive text for your interface.
You can also enter supplementary text, which is for display only, by selecting the Text command from the Interfaces menu. The Text command accesses a freestanding window rather than a separate sheet of the Define Interface dialog. For more details about entering interface text by using the freestanding editor window, see "Using the Free-Standing Editor Window to Define Text", in Chapter 3. See also "Specifying Text for a Schema Element", in Chapter 3.
The editor determines the behavior of the text editor window. Text is not automatically wrapped to fit the current window size. When you want text to start in the next line, press Ctrl+Enter. (If you want text to wrap in text and source windows, see "Maintaining Editor Options", in Chapter 2.)
Click the OK button. Alternatively, click the Cancel button to abandon your class selections or the Next button to define another interface.
