java使用Jena读取RDF数据失败

Question

下面的代码是读取模式和数据文件以查找rdf。科林和人的类型。但是，我得到了一个错误：

线程“main”组织中出现异常。阿帕奇。耶拿。暴乱RiotException:[行：1，列：1]在prolog中不允许包含内容。代码如下：

public void reason(){
    String NS = "urn:x-hp:eg/";

    String fnameschema = "D://Work//EclipseWorkspace//Jena//data//rdfsDemoSchema.rdf";
    String fnameinstance = "D://Work//EclipseWorkspace//Jena//data//rdfsDemoData.rdf";

Model schema = FileManager.get().loadModel(fnameschema);
Model data = FileManager.get().loadModel(fnameinstance);

InfModel infmodel = ModelFactory.createRDFSModel(schema, data);

Resource colin = infmodel.getResource(NS+"colin");

System.out.println("Colin has types");

for (StmtIterator i = infmodel.listStatements(colin, RDF.type, (RDFNode)null); i.hasNext(); ) {
       Statement s = i.nextStatement();
       System.out.println(s); 
} 

Resource Person = infmodel.getResource(NS+"Person");
System.out.println("\nPerson has types:");
for (StmtIterator i = infmodel.listStatements(Person, RDF.type, (RDFNode)null); i.hasNext(); ) {
    Statement s = i.nextStatement(); 
    System.out.println(s);
} 

}

文件rdfsDemoData。rdf

@prefix eg: <urn:x-hp:eg/> .
<Teenager rdf:about="&eg;colin">
  <mum rdf:resource="&eg;rosy" />
  <age>13</age>
</Teenager>

文件rdfsDemoSchema。rdf

@prefix eg: <urn:x-hp:eg/> .

<rdf:Description rdf:about="&eg;mum">
  <rdfs:subPropertyOf rdf:resource="&eg;parent"/>
</rdf:Description>

<rdf:Description rdf:about="&eg;parent">
  <rdfs:range  rdf:resource="&eg;Person"/>
  <rdfs:domain rdf:resource="&eg;Person"/>
</rdf:Description>

<rdf:Description rdf:about="&eg;age">
  <rdfs:range rdf:resource="&xsd;integer" />
</rdf:Description>

Answer 1

您的数据语法错误。您正在混合海龟和RDF/XML。RDF/XML没有@prefix——它使用XML的名称空间。看起来您需要一个XML实体声明，如：

<?xml version="1.0"?>
<!DOCTYPE rdf:RDF [
    <!ENTITY eg "urn:x-hp:eg/" >
]>
...