XML : Retrieve namespace value of XML using digester

I am trying to extract information from a XML file and able to extract values without its properties.

Code:

  public class NRusEntity {      private String code;      private String name;      private String saltForm;        getters and setters      ...    

Parser Class:

         ...          String filePath = FileUtility.getOwlFilePath();                               try {              Digester digester = new Digester();              digester.setValidating(false);                //digester.setNamespaceAware(true);                digester.addObjectCreate("rdf:RDF", NRus.class);              digester.addObjectCreate("rdf:RDF/owl:Class", NRusEntity.class);                digester.addCallMethod("rdf:RDF/owl:Class/Preferred_Name", "setName", 0);              digester.addCallMethod("rdf:RDF/owl:Class/code", "setCode", 0);                /**This commented part creates exception*/                 //digester.addCallMethod("rdf:RDF/owl:Class/Has_Salt_Form", "setSaltForm", 2);              //digester.addCallParam("rdf:RDF/owl:Class/Has_Salt_Form", 0);              //digester.addCallParam("rdf:RDF/owl:Class/Has_Salt_Form", 1, "rdf:resource");                  digester.addSetNext("rdf:RDF/owl:Class", "addEntry");              File input = new File(filePath);              digester.parse(input);          }           ...    

XML Looks like this:

  <?xml version="1.0"?>    <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"   xmlns:owl="http://www.w3.org/2002/07/owl#">        <owl:Class rdf:about="#z">          <Preferred_Name rdf:datatype="http://www.w3.org/2001/XMLSchema#string">von</Preferred_Name>          <code rdf:datatype="http://www.w3.org/2001/XMLSchema#string">XY221</code>          <Has_Format rdf:resource="http://zlib.com#Ni_Hydro"/>      </owl:Class>      ...  </rdf:RDF>    

How can I extract the URI value

  "http://zlib.com#Ni_Hydro"     

from that XML line

  <Has_Format rdf:resource="http://zlib.com#Ni_Hydro"/>