We want to track the source of each article, so we will start by creating the different types of people and services that originate articles. First we will create a new class called Columnist:
Select the Classes Tab.
Locate the Class Hierarchy area in the Class Browser pane at the left of the Protege window. This area displays the hierarchy of classes, with the current class highlighted.
Make sure that class :THING is highlighted. Almost all the classes you create will be created subordinate to :THING. The class :SYSTEM_CLASS is used by Protege-Frames for defining the structure of various Protege forms.
Click the Create Class button at the top right of the Class Browser. A class is created with a generic name based on the name of the project, such as "tutorial_Class_0". You can see the name in the Class Browser and it is highlighted to show it is selected.
Type Columnist. A recommended Protege-Frames convention is to make the first character of each word in a class name uppercase and the rest lowercase, and to separate words with an underscore.
Hit Enter or click again on the highlighted class to complete and display your change.
If you have trouble renaming a class, look at the Class Editor pane at the right of the Protege-Frames window. The generic name of the class you just created should be displayed and highlighted in the Name field. If the correct generic name is displayed, but not highlighted, simply double-click in the Name field to edit the name. If the incorrect name is displayed, then the wrong class is selected in the Class Hierarchy area. Click on the class you want to rename.