使用JENA创建模型

Question

我在语义Web领域是新手，我正在尝试使用JENA创建一个Java模型以从OWL文件中提取类，子类和/或注释。

关于如何做这种事情的任何帮助/指导，将不胜感激。

谢谢

Answer 1

您可以使用Jena Ontology API进行操作。该API允许您从owl文件创建一个本体模型，然后提供对Java中存储在本体中的所有信息的访问。这是Jena ontology的快速介绍。本简介包含有关Jena Ontology入门的有用信息。

代码通常看起来像这样：

String owlFile = "path_to_owl_file"; // the file can be on RDF or TTL format

/* We create the OntModel and specify what kind of reasoner we want to use
Depending on the reasoner you can acces different kind of information, so please read the introduction. */
OntModel model = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM);

/* Now we read the ontology file
The second parameter is the ontology base uri.
The third parameter can be TTL or N3 it represents the file format*/
model.read(owlFile, null, "RDF/XML"); 

/* Then you can acces the information using the OntModel methods
Let's access the ontology properties */
System.out.println("Listing the properties");
model.listOntProperties().forEachRemaining(System.out::println);
// let's access the classes local names and their subclasses
try {
            base.listClasses().toSet().forEach(c -> {
                System.out.println(c.getLocalName());
                System.out.println("Listing subclasses of " + c.getLocalName());
                c.listSubClasses().forEachRemaining(System.out::println);
            });
        } catch (Exception e) {
            e.printStackTrace();
   }
// Note that depending on the classes types, accessing some information might throw an exception.

这里是Jena Ontology API JavaDoc。

我希望它有用！