读取OWL / XML的问题

使用Jena从Java读取OWL / XML文件时遇到问题。

I have a problem reading OWL/XML files from Java using Jena.

我在读取RDF / XML文件时没有问题，但每当我从Protege创建一个OWL / XML文件并尝试读取它时，Java都会给出以下错误：
WARN [main]（RDFDefaultErrorHandler.java:36）
线程main中的异常java.lang.NullPointerException
at com.hp.hpl.jena.rdf.arp.impl.XMLHandler.endElement （XMLHandler.java:143）

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)

我用来检索RDF / XML的代码如下：

The code that I use to retrieve RDF/XML is below :

OntModel ontModel = ModelFactory.createOntologyModel();
InputStream in = FileManager.get().open(inputFileName);
    if (in == null) {
        throw new IllegalArgumentException( "File: " + inputFileName + " not found");
    }
    ontModel.read(in, "");

此代码完美地适用于RDF / XML。但是，我无法读取OWL / XML。我看着互联网，我找不到任何东西。
如果有人给我指路，我真的很感激。
非常感谢

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