text: We are going to add two simple SWRL rules to our Pizza ontology to compute discounts for some 
  Customers. We are assuming that our Pizza restaurant hasn’t been in business long, so they want to 
  give a discount to anyone who has purchased more than one Pizza. Also, their manager overestimated 
  the love of spicy ingredients of their customers, and they have a lot of Jalapeno peppers that they want to 
  use before they go bad, so they are offering a larger discount to customers who prefer Hot pizzas rather 
  than those who prefer Medium or Mild. 
  
  To begin with let’s write the first rule to give a 20% discount to all customers who have purchased more 
  than 2 Pizzas and prefer Hot Pizzas. 