title: Delete individuals with owlready2
body: <p><br>
  I am using owlready2 I load my ontology and I tried to delete the individuals of a class :  </p>
  
  <pre><code>from owlready2 import *
  onto = get_ontology("file://C:/Users/stef/Desktop/my_onto.owl").load()
  
  country_list=onto.search(type=onto.Country)
  len(country_list) ----&gt; Out[27]: 219
  
  for indiv in country_list :
      destroy_entity(indiv)
  
  onto.search(type=onto.Country)-----&gt; Out[29]: []
  
  onto.save
  </code></pre>
  
  <p>it seems to me that the individuals in the class Country are deleted <strong>But</strong> when I open the ontology with protégé I found the individuals <br>
  someone tell me what I am missing !</p>