text: 5.1 Defining a Data Property 
  As with other OWL entities, datatype properties can be defined either via the Data properties tab in the 
  Entities tab or in the Data properties tab available via the Window>Tabs>Data properties option. 
  
  We will use datatype properties to describe the calorie content of pizzas. We will then use some numeric 
  ranges to broadly classify particular pizzas as high or low calorie. In order to do this we need to complete 
  the following steps: 
  
  1. Create a datatype property hasCaloricContent, which will be used to state the calorie content 
  
  of particular pizzas. 
  
  2. Create several example Pizza individuals with specific calorie contents. 
  3. Create two classes broadly categorizing pizzas as low or high calorie. 