text: Figure 8.1 Graph of Some of the New Ontology Classes and Individuals 
  
  Figure 8.1 uses the OntoGraf tab to visualize some of the new additions to the ontology. There is a new 
  class called Person with subclasses Employee and Customer. Employee has 5 individuals: Manager, 
  Chef, Waiter1, and Waiter2. Customer has 10 instances. 
  
  In addition, if you look at the Object properties tab you will see there are some new properties: 
  
  • The property purchasedByCustomer has domain Pizza and range Customer. It maps from 
  
  an individual Pizza to the Customer that purchased it. It has an inverse called 
  purchasedPizza. 
  
  • The property hasSpicinessPreference has domain Customer and range Spiciness. It 
  
  records the preference the Customer has for how spicy they usually like their Pizza. 