[英]Getting superclasses in imported OWL ontology
I'm trying to parse an ontology (complete including the imported ontology) to store it into a graph database. 我正在尝试解析本体(包括导入的本体)以将其存储到图形数据库中。 To do this, I first list all classes in the ontology and then link them to their respective super classes. 为此,我首先列出本体中的所有类,然后将它们链接到各自的超类。
The code works fine, except for imported super classes. 代码工作正常,除了导入的超类。 I can link to super classes within my own ontology but not from a class whose superclass is in the imported ontology. 我可以链接到我自己的本体中的超类,但不能链接到其超类在导入的本体中的类。 The superclass exists, I can see it if I print it after the getClasesInSignature() method call because I specified true to add imported classes. 超类存在,如果我在getClasesInSignature()方法调用之后打印它,我可以看到它,因为我指定了true来添加导入的类。
In this code example, an output of the superclasses set would be empty for classes as described above. 在此代码示例中,如上所述,超类集的输出对于类是空的。 Is there a way to include them? 有没有办法包括它们?
public void importOntology(String ontologyFile) throws Exception {
try {
File file = new File(ontologyFile);
if (file.exists()) {
OWLOntologyManager manager = OWLManager.createOWLOntologyManager();
OWLOntology ontology = manager.loadOntologyFromOntologyDocument(file);
OWLReasonerFactory reasonerFactory = PelletReasonerFactory.getInstance();
OWLReasoner reasoner = reasonerFactory.createReasoner(ontology, new SimpleConfiguration());
if (!reasoner.isConsistent()) {
throw new Exception("Ontology is inconsistent");
}
Transaction tx = db.beginTx();
try {
//create starting node
Node thingNode = getOrCreateNodeWithUniqueFactory("owl:Thing");
//add all classes
for (OWLClass c :ontology.getClassesInSignature(true)) {
String classString = c.toString();
if (classString.contains("#")) {
classString = classString.substring(classString.indexOf("#")+1,classString.lastIndexOf(">"));
}
//create node
Node classNode = getOrCreateNodeWithUniqueFactory(classString);
Set<OWLClassExpression> superclasses = c.getSuperClasses(ontology);
//top level node
if (superclasses.isEmpty()) {
//link to thing
} else {
//link to superclass(es)
}
//[rest of code removed]
}
}
}
OK, after some research, I found out that OWLReasoner also has a function to get super classes. 好吧,经过一些研究,我发现OWLReasoner也有一个获得超级课程的功能。 This method includes the super classes from imported ontologies and has even the possibility to distinguish between direct and indirect superclasses. 该方法包括来自导入本体的超类,甚至可以区分直接和间接超类。 It's a bit strange though that getClassesInSignature() includes those without accessing the reasoner but this works fine and solved my problem. 虽然getClassesInSignature()包含那些没有访问推理器但是工作正常并解决了我的问题,这有点奇怪。
The code would be 代码将是
NodeSet<OWLClass> superclasses = reasoner.getSuperClasses(c, true);
to get the classes. 获得课程。 The return type is different, whch is why the following has to be changed as well: 返回类型不同,这就是为什么还必须更改以下内容:
for (org.semanticweb.owlapi.reasoner.Node<OWLClass> parentOWLNode: superclasses) {
OWLClassExpression parent = parentOWLNode.getRepresentativeElement();
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.