title: Problem of reading OWL/XML
body: <p>I have a problem reading OWL/XML files from Java using Jena. </p>
  
  <p>I have no problem reading RDF/XML files, but whenever I create a OWL/XML file from Protege and try to read it, Java gives this error below :
  WARN [main] (RDFDefaultErrorHandler.java:36)
  Exception in thread "main" java.lang.NullPointerException
   at com.hp.hpl.jena.rdf.arp.impl.XMLHandler.endElement(XMLHandler.java:143)</p>
  
  <p>The code that I use to retrieve RDF/XML is below :</p>
  
  <pre><code>OntModel ontModel = ModelFactory.createOntologyModel();
  InputStream in = FileManager.get().open(inputFileName);
      if (in == null) {
          throw new IllegalArgumentException( "File: " + inputFileName + " not found");
      }
      ontModel.read(in, "");
  </code></pre>
  
  <p>This code works with RDF/XML perfectly. However, I cannot read an OWL/XML. I looked at Internet and I couldn't find anything.
  I would really appreciate, if someone shows me a way.
  Many thanks</p>