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8.1 Get Familiar with the Larger Ontology 
 
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.