text: Paste that into the SPARQL query view and hit Execute and you should see the returned value: 15. 
  However, remember this isn’t really all the Pizzas because a few of the purchases were recorded on the 
  Pizza rather than on the Customer. To get the full number we can take advantage of the fact that we 
  have recorded the number of pizzas that each customer has purchased and use the SPARQL SUM 
  function. That query would be: 
  
  SELECT (SUM(?pnumber) AS ?psum) 
  
  WHERE { ?customer pizza:numberOfPizzasPurchased ?pnumber} 
  
  This should give you the correct number of 17. 
  
  9.22 SPARQL and IRI Names 
  If you recall, at the beginning of the tutorial we changed the preference for creating new entities to*user*
  *supplied name*rather than*auto-generated name*which is the default. Now that you have seen examples of 
  using SPARQL we can explain why. With auto-generated names rather than have names such as 
  Customer or purchasedByCustomer our entities would have names such as 
  OWLPropertyA4257yri73ff90rmbx and OWLClass23gkb0tk5kd30tm. Thus, the first query would 
  be something like: 