java - 使用jena修改预定义本体

Question

我通过 Protege 创建了我的本体。我的本体有一些类和实例。现在我要通过 jena 添加其他类和实例，这就是为什么我编写以下代码以在此类中创建一个新类和一个实例的原因。新类的名称是“person”，新实例的名称是“base”。当我在 java 中运行此代码时，它可以正常工作并创建类和实例。但是当我回到 protege 时，我看不到新类和新实例。你有什么想法可以帮助我吗？ 谢谢

public void create_model(){                   
    modelMem = ModelFactory.createOntologyModel(OntModelSpec.OWL_DL_MEM);
    ModelMaker modelMaker = ModelFactory.createFileModelMaker("Ontologies/VBnet.owl");
    Model modeltmp = modelMaker.createDefaultModel();
    modelMem = ModelFactory.createOntologyModel(OntModelSpec.OWL_DL_MEM, modeltmp);
    System.out.println("Model has been Successfully Built");

}
public void addFile() {
    System.out.println("Loading from FOAF instance File");
    InputStream inFoafInstance =FileManager.get().open("Ontologies/VBnet.owl");
    modelMem.read(inFoafInstance, defaultNameSpace);
    //inFoafInstance.close();
    System.out.println(modelMem.toString());

}
public void adddata() {
   OntClass person = modelMem.createClass(defaultNameSpace + "Person");
   Individual l1 = modelMem.createIndividual( defaultNameSpace + "base", person );
   for (Iterator i = l1.listRDFTypes(true); i.hasNext(); )
       System.out.println( l1.getURI() + " is asserted in class " + i.next() );
}

public static void main(String[] args) {
    AddInfo add=new AddInfo();
    add.create_model();
    add.addFile();
    add.adddata();
}

Answer 1

您似乎没有保存更改后的模型:

OutputStream out = new FileOutputStream("altered.rdf");
modelMem.write( out, "RDF/XML-ABBREV"); // readable rdf/xml
out.close();