text: 1. Navigate to the Entities tab5 with the Class hierarchy view selected. Make sure owl:Thing is selected. 
  
  2. Press the Add Subclass icon shown in figure 4.4. This button creates a new subclass of the selected 
  class. In this case we want to create a subclass of owl:Thing. 
  
  3. This should bring up a dialog titled Create a new class with a field for the name of the new class. Type 
  in Pizza and then select OK. 
  
  4. Repeat the previous steps to add the classes PizzaTopping and PizzaBase ensuring that 
  owl:Thing is selected before using the add subclass icon so that all your classes are subclasses of 
  owl:Thing. Your user interface should now look like figure 4.5. Don’t worry that some of the classes 
  are highlighted in red. That is because the reasoner hasn’t run yet. We will address this shortly. 
  
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