text: 4.7 Inverse Properties 
  Each object property may have a corresponding inverse property. If some property links individual a to 
  individual b then its inverse property will link individual b to individual a. For example, in figure 3.3 the 
  individual Michael hasPet Buddy. In this example hasPet is an object property that maps from a 
  Person to their Pet which are known as the domain and range of the property. Michael is an instance 
  of the Person class and Buddy is an instance of the Pet class. The hasPet property points from a 
  Person to that person’s Pet. The inverse property could be isPetOf which would be represented by a 
  link between the two individuals going the other way, from Buddy to Michael. Whenever possible it is 
  desirable to adhere to this type of naming standard with properties. Properties going in one direction as 
  *hasProperty*and their inverses as*isPropertyOf*. 
  
  **Exercise 10: Create some inverse properties**
  
  __ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ___
  
  1. Use the Object properties tab to create a new object property called isIngredientOf (this will be 
  the inverse property of hasIngredient). Make sure that isIngredientOf is a sibling property if 
  hasIngredient and a sub-property of owl:topObjectProperty. 
  
  2. Click on the Add icon (+) next to Inverse Of in the Description view for hasIngredient. You will 
  be presented with a window that shows a nested view of all the current properties. Select hasIngredient to 
  make it the inverse of isIngredientOf. 
  
  3. Select isIngredientOf and then Tools>Create object property hierarchy. Enter isToppingOf then on a 
  new line enter isBaseOf. As before, select Continue and leave the box for disjoint properties unchecked 
  and select Finish. Repeat step 2 to make isToppingOf the inverse of hasTopping and isBaseOf the 
  inverse of hasBase. 
  
  4. Synchronize the reasoner. Your window should now look like figure 4.12. 
  
  __ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ___