text: Chapter 9 Queries: Description Logic and SPARQL 
  Now that we have some individuals in our ontology, we can do some interesting queries. There are 
  several tools for doing queries in Protégé. 
  
  9.1 Description Logic Queries 
  To start with the most straight forward one based on what you have already learned are Description Logic 
  (DL) queries. These are essentially the same kind of statements you have been using to define classes. 
  However, in addition to using such statements to define a class you can use it as a query. 
  
  **Exercise 33: Try Some Description Logic Queries**
  
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  1. To begin with navigate to the DL Query tab. If it doesn’t exist create it using: Window>Tabs>DL 
  Query. 
  
  2. At the top right of this tab you should see a view that says DL query: and below it Query (class 
  expression). 
  
  3 You can enter any DL statement you want in this box and then see all the entities that are subclasses, 
  superclasses, and instances of it. As an example, enter: Customer and purchasedPizza some (hasTopping 
  some (hasSpiciness value Hot)). I.e., all Customers who have purchased a Pizza that hasSpiciness 
  Hot. At first you may not see anything but don’t worry there is one more step. 