title: Prefix not always shown in some Ontology imports in Protege
body: <p>Could someone explain why Protégé (5.2) is adding a prefix to some classes and to some not? View is set to short IRI name.</p>
  
  <p>I see <code>foaf:Agent</code>, <code>dcterm:Agent</code> or <code>geo:SpatialThing</code>. But no <code>bio:Event</code>, only <code>Event</code>!</p>
  
  <p>Here is the ontology:</p>
  
  <pre><code>@prefix : &lt;http://www.semanticweb.org/anato/ontologies/2017/7/untitled-ontology-210#&gt; .
  @prefix bio: &lt;http://purl.org/vocab/bio/0.1/&gt; .
  @prefix owl: &lt;http://www.w3.org/2002/07/owl#&gt; .
  @prefix rdf: &lt;http://www.w3.org/1999/02/22-rdf-syntax-ns#&gt; .
  @prefix xml: &lt;http://www.w3.org/XML/1998/namespace&gt; .
  @prefix xsd: &lt;http://www.w3.org/2001/XMLSchema#&gt; .
  @prefix foaf: &lt;http://xmlns.com/foaf/0.1/&gt; .
  @prefix rdfs: &lt;http://www.w3.org/2000/01/rdf-schema#&gt; .
  
  &lt;http://www.semanticweb.org/anato/ontologies/2017/7/untitled-ontology-210&gt; a owl:Ontology ;
      owl:imports &lt;http://purl.org/vocab/bio/0.1/&gt; , &lt;http://www.w3.org/2006/time#2016&gt; , &lt;http://xmlns.com/foaf/0.1/&gt; .
  # 
  # 
  # #################################################################
  # #
  # #    Classes
  # #
  # #################################################################
  # 
  # 
  # http://xmlns.com/foaf/0.1/Person
  
  foaf:Person a owl:Class .
  # 
  # Generated by the OWL API (version 4.2.6.20160910-2108) https://github.com/owlcs/owlapi
  </code></pre>