how to get a graph from ana xml file

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Java

I used the api jgraph
below the content of the xml file and the java code but I did not get the result that I expect
I was not able to insert a picture corresponding to the graph that I desire to draw
this is the content of my xml file

<?xml version="1.0" encoding="ISO-8859-1" ?>
- <annotation>
- <concepts>
  <concept>Person</concept>
  <concept>Actor</concept>
  </concepts>
- <triplets>
- <triplet>
- <subject>
  <value>Willard Christopher</value>
  <instanceOf>Person</instanceOf>
  </subject>
  <predicate>equivalent</predicate>
- <object>
  <value>Will" Smith Jr</value>
  <instanceOf>Actor</instanceOf>
  </object>
  </triplet>
  </triplets>
  </annotation>

this my code java :

	import java.awt.BorderLayout;
import java.io.File;
import java.io.IOException;
import java.util.List;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import com.mxgraph.swing.mxGraphComponent;
import com.mxgraph.util.mxConstants;
import com.mxgraph.view.mxGraph;

		public class Final {
			
		public static Object valSubject =null;
		public static Object valInstance =null;
		
		public Final () {}
		
		public JFrame frame;
		/** Pour éviter un warning venant du JFrame */
		private static final long serialVersionUID = -8123406571694511514L;
		public void dessin(String filename) throws SAXException, IOException,
				ParserConfigurationException {
			frame = new JFrame();
			JPanel contentPane;
			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			frame.setSize(400, 320);
			frame.setVisible(true);
			frame.setBounds(100, 100, 550, 400);
			contentPane = new JPanel();
			contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
			contentPane.setLayout(new BorderLayout(0, 0));
			mxGraph graph = new mxGraph();
			Object parent = graph.getDefaultParent();
			
			graph.getModel().beginUpdate();
			
			File nomf = new File(filename);
			DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
			DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
			Document doc = dBuilder.parse(nomf);
			doc.getDocumentElement().normalize();
			
			
			//System.out.println( doc.getDocumentElement().getNodeName());
			//NodeList nodes = doc.getElementsByTagName("triplet");

			try {
			double h =  80;
			double l =  80;
			
			
			Element root=doc.getDocumentElement();
			while(root.hasChildNodes())
			{	
			NodeList concepts = doc.getElementsByTagName("concepts")	;
			NodeList triplets  = doc.getElementsByTagName("triplet");	
			
			for (int i = 0; i < concepts.getLength(); i++)
			{
				Node nodeC=concepts.item(i);
				Element elementC =(Element) nodeC ;
				Object composantconcept=graph.insertVertex(parent,null, concepts.item(i).getNodeValue()/*getValue("concept", elementC)*/, h,l,
						20,20,mxConstants.STYLE_SHAPE + "="
								+ mxConstants.SHAPE_ELLIPSE);

				String s=getValue("concept",elementC);	
				
				for (int j = 0; j < triplets.getLength(); j++)
				{ 
					
					Node node = triplets.item(j);

			    	if (node.getNodeType() == Node.ELEMENT_NODE) {
			    	Element elementT = (Element) node;
			    	
					
				
					if (triplets.item(j).equals("subject"))
					{
					Object	valsubject = graph.insertVertex(parent, null, getValue("value", elementT)
							,h, l,
							20, 20);
					
					
					if (triplets.item(j).equals("instanceOf"))
					{ if (triplets.item(j).getNodeValue()== s ){
						
					
					graph.insertEdge(parent, null, null,valsubject ,composantconcept);
					
					}}
					
					

					if (triplets.item(j).equals("object"))
					{
					Object	valobject = graph.insertVertex(parent, null, getValue("value", elementT),
							h, l,
							20, 20);
					
					
					if (triplets.item(j).equals("instanceOf"))
					{ if (triplets.item(j).getNodeValue()== s ){
						
					
					graph.insertEdge(parent, null, null,valobject ,composantconcept);
					}}
					
				
			
				
				
				if( triplets.item(j).equals("instanceOf")   )
				{
					Object rectangle =graph.insertVertex(parent, null, 
							getValue("value", elementT),
							h, l, 80, 30);
					
					if(triplets.item(j).getNodeValue()==s){
						graph.insertEdge(parent,null, null, rectangle, composantconcept);
				}}
				
				
            graph.insertEdge(parent, null, getValue("predicate", elementT),valsubject, valobject);			
				 
				 }}
			
					
						l = l + 60;
						h = h + 60;
				
				
			
		
				}}}}}
			catch (Exception ex) {
				ex.printStackTrace();
			}
			finally {
				graph.getModel().endUpdate();
			}
			mxGraphComponent graphComponent = new mxGraphComponent(graph);
			frame.add(graphComponent);}
			

		private static String getValue(String tag, Element element) { 
			NodeList nodes = element.getElementsByTagName(tag).item(0).getChildNodes();
			Node node = (Node) nodes.item(0);
			return node.getNodeValue();
		}
	public static void main(String[] args) throws SAXException, IOException,
				ParserConfigurationException {
           System.out.print("bonjour");
			Final frame = new Final();
			frame.dessin("C:/Users/Hela/Desktop/copie.xml");
		
		
	}}