如何使用现有本体从XML文件提取RDF三元组? [英] How to extract RDF triples from XML file using an existing ontology?

问题描述

我正在尝试使用现有的本体从XML文件提取RDF三元组.我正在使用Java，并且可以使用XPath从XML和Jena提取数据以读取和写入RDF文档和本体.如何根据现有本体从XML中提取相关的三元组?

I am trying to extract RDF triples from XML files by using an existing ontology. I am using Java, and can use XPath to extract data from XML and Jena to read and write RDF documents and ontologies. How can I extract the relevant triples from the XML according to the existing ontology?

推荐答案

忘了XPath来提取三元组，这对Jena来说更容易，也不会出现问题.

Forget about XPath to extract triples, it way easier and less problematic with Jena.

您可以将接口SimpleSelector与来自Jena的model.listStatements一起使用.

You can use the interface SimpleSelector together with model.listStatements from Jena.

在此示例中，我使用SimpleSelector查找具有单个属性的所有三元组，但是您可以通过自定义方法selects来实现所需的任何搜索.

In this example I am using SimpleSelector to find all the triples with a single property but you can implement the any search you need by customizing the method selects.

FileManager fManager = FileManager.get();
Model model = fManager.loadModel("some_file.rdf");

Property someRelevantProperty = 
    model. createProperty("http://your.data.org/ontology/",
                          "someRelevantProperty");

SimpleSelector selector = new SimpleSelector(null, null, (RDFNode)null) {
    public boolean selects(Statement s)
        { return s.getPredicate().equals(someRelevantProperty);}
}

StmtIterator iter = model.listStatements(selector);
while(it.hasNext()) {
   Statement stmt = iter.nextStatement();
   System.out.print(stmt.getSubject().toString());
   System.out.print(stmt.getPredicate().toString());
   System.out.println(stmt.getObject().toString());
}

您可以在此处找到更多信息.

You'll find more information here.

如果您多描述一些您正在使用的本体以及您需要的搜索类型，我们也许可以提供更多帮助.

If you describe a bit more the ontology you are using and the type of search you need we might be able to help more.

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