如何使用 Jena 库从 Ontology in Java 中读取所有对象属性？

Question

我想读取 OWL 文件中存在的所有对象属性。我使用 Protege 工具创建了 OWL 文件。我也加载了模型，但无法获取对象属性。

For Example: if I have a class in Ontology named as Car and which has several Object and Data properties linked to it, such as hasColor, hasAudioSystem,hasGps.

我想通过域和范围或仅通过 class 的名称获取与特定 class 链接的所有对象属性。请帮忙..

Answer 1

如果您想获取类型声明为域或范围的对象属性列表，使用 Jena 的一种方法如下：

public void objectPropertiesForType(Model m, final Resource type) {
    StmtIterator i = m.listStatements(new SimpleSelector() {
        @Override
        public boolean test(Statement s) {
            if (s.getPredicate().equals(RDFS.domain)
                    || s.getPredicate().equals(RDFS.range)) {
                return (s.getObject().equals(type));
            }
            return false;
        }
    });
    while (i.hasNext()) {
        Statement s = i.next();
        System.out.println("Property: " + s.getSubject().getURI());
    }
}

Answer 2

在耶拿，您可能想要为 class 检索 OntClass 的实例，然后使用 listDeclaredProperties 方法，这将：

Return an iterator over the properties associated with a frame-like view of this class. This captures an intuitive notion of the properties of a class. This can be useful in presenting an ontology class in a user interface, for example by automatically constructing a form to instantiate instances of the class. The properties in the frame-like view of the class are determined by comparing the domain of properties in this class's OntModel with the class itself.

如何使用 Jena 库从 Ontology in Java 中读取所有对象属性？

How to read all object properties from Ontology in Java using Jena library?

java

rdf

owl

apache-jena