java - 我无法访问对象属性

Question

我正在使用 Java 和 Jena API。我有一个 class Marriage，它有 3 个对象属性，分别称为“hasHusband”、“Haswife”和“结婚日期”。前两个与 class Person 相关联，它具有 hasFirstName、hasLastName、dateOfBirth 等数据类型属性....

我想访问对象属性“Haswife”和“hasHusband”，然后是妻子的名字和丈夫的名字。

这是我的 rdf 文件中的表示方式:

(...)

  <j.0:FAMmariage rdf:about=http://www.fam.com/FAM#BrunoCatherine> 

  <j.0:FAMaDateMariage>25/07/2011</j.0:FAMaDateMariage>

   <j.0:FAMhasWife>
     <rdf:Description rdf:about="http://www.fam.com/FAM#Catherine20/03/1982">
       <j.0:FAMDateOfBirth>20/03/1980</j.0:FAMDateOfBirth>
       <j.0:FAMHasName>Gomez</j.0:FAMHasName>
       <j.0:FAMHasFirstName>Catherine</j.0:FAMHasFirstName>
    </rdf:Description>
  </j.0:FAMHasWife>

   <j.0:FAMHusband>
     <rdf:Description rdf:about="http://www.fam.com/FAM# Bruno15/06/1980 ">
       <j.0:FAMaDateOfBirth>15/06/1980 </j.0:FAMDateOfBirth>
       <j.0:FAMHasName>Jeandet </j.0:FAMHasName>
       <j.0:FAMHasFirstName>Bruno</j.0:FAMHasFirstName>
     </rdf:Description>
   </j.0:FAMHusband>

 </j.0:FAMmariage>
(...)

我试过了，还是不行:

StmtIterator iter = onto.model.listStatements();  
    while (iter.hasNext()) {
        Statement stmt = iter.nextStatement();  
        Resource  subject = stmt.getSubject();     
        Property  predicate = stmt.getPredicate();   
        RDFNode   object = stmt.getObject();
        if (predicate.equals(onto.hasWife))
        {       
           System.out.print(" " + object.toString() + " ");
        }
  }

你能告诉我哪里出了问题吗？

谢谢

已编辑

更多有用的细节:

(...)

person = model.createClass(uriBase+"person");
person.addSubClass(man);
person.addSubClass(woman);
marriage = model.createClass(uriBase+"marriage");

(...)

hasHusband = model.createObjectProperty(uriBase+"hasHusband");
hasHusband.setDomain(marriage);
hasHusband.setRange(man);

hasWife = model.createObjectProperty(uriBase+"hasWife");
hasWife.setDomain(marriage);
hasWife.setRange(woman);

hasFirstName = model.createDatatypeProperty(uriBase+"hasFirstName"); 
hasFirstName.setDomain(person);
hasFirstName.setRange(XSD.xstring);

(...)

Answer 1

那行得通吗？

ont.hasWife=model.createProperty("your namespace URI here","FAMhasWife");

StmtIterator iter = onto.model.listStatements(null,onto.hasWife,(RDFNode)null);  
    while (iter.hasNext()) {
        Statement stmt = iter.nextStatement();  

           System.out.print(stmt.getObject().toString());
  }