title: Protege OWL Calculate the sum of a property of the children of a class
body: <p>in my ontology i got a Recipe-Class which got multiple "children", which are of the class Food. Those foods have Nutritions (protein, carbs, fats...).</p>
  
  <p>Recipe->Food->Nutrition->NutritionAmount</p>
  
  <p>Is it possible to calculate the sum of the proteins of Recipe x with reasoning rules? With Sparql its working well.</p>