Tutorial: Getting Started with Protege-Frames
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Adding an additional superclass to an existing class
As mentioned above, we want a Columnist to be an Employee. Since we have already created the Columnist class, we do not create want to create it again. Instead, we make the existing Columnist class a subclass of Employee as follows:
  1. Select Columnist in the Class Browser.



  2. Find the Superclasses pane at the bottom left of the Protege window, under the Class Browser. Notice that when Columnist is selected, the current superclass of Columnist, Author, is displayed in the Superclasses pane.



  3. Click the Add Superclass button at the top right of the Superclasses pane. A Select Classes dialog box displays all the classes you have created so far, organized in the class hierarchy.



  4. Highlight Employee and click OK. Columnist now has two superclasses: Author and Employee. Both superclasses are shown in the Superclasses pane.



  5. Note that an icon has appeared to the left of Employee. Click this icon to expand the children of Employee. Columnist now appears in two places in the Class Browser: once under Author and again under Employee.