PrF UG classes class buttons
The Class Buttons
The class buttons (, , , ), located at the top right of the Class Browser, allow you to view and edit, view references to, create, or delete a class.
The buttons have the following actions:
The Create Class button () creates a new class as a subclass of the highlighted class.
The Delete Class button () deletes the highlighted class and all of its subclasses.
If the Create Class or Delete Class button is grayed out, this indicates that the current class cannot be edited or deleted. A non-editable class always has a pale class icon to its left. A class cannot be edited if it is a system class or if it is included from another project.
The buttons above have the same operation wherever they appear. Additional buttons in the Protege-Frames interface allow you to add and remove the classes specified in a slot, field, or other relationship.