SVGGraphics2D how to group elements

[kpu]

Hi,
 I wish grouped elements "by component".

This code example below generate this svg content
...
<g>
 <g style="fill:blue; stroke:blue;">
  <circle r="25" style="stroke:none;" cx="25" cy="25"/>
  <rect x="0" y="50" width="50" style="fill:lime; stroke:none;"
height="50"/>
 </g>
</g>
</svg>

But i would like this (group by component) :
<g>
  <g style="fill:blue; stroke:blue;">
     <circle r="25" style="stroke:none;" cx="25" cy="25"/>
     ...
  </g>
  <g> 
     <rect x="0" y="50" width="50" style="fill:lime; stroke:none;"
height="50"/>
     ...
  </g>
</g> 

I try  create a <g> element and call
method  getDOMTreeManager().appendGroup(element_g, getDomGroupManager())
but element <g> is simply added, non become parent of future painting 
operations of the component.

Is this possible ? 
Thanks.

//example 

import java.awt.Graphics;
import java.awt.Polygon;
import java.awt.Rectangle;
import java.awt.Graphics2D;
import java.awt.Color;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.io.IOException;

import javax.swing.JFrame;
import javax.swing.JPanel;

import org.apache.batik.svggen.SVGGraphics2D;
import org.apache.batik.dom.GenericDOMImplementation;

import org.w3c.dom.Document;
import org.w3c.dom.DOMImplementation;

class MyForm1 {
   public void draw(Graphics2D g) {      
      g.setColor(Color.BLUE);
      g.fillOval(0, 0, 50, 50);
   }
}

class MyForm2{
   public void draw(Graphics2D g) {
      g.setColor(Color.GREEN);
      g.fillRect(0, 50, 50, 50);
   }
}

public class TestSVGGen {

   public static void main(String[] args) throws IOException {
      // Get a DOMImplementation.
      DOMImplementation domImpl = GenericDOMImplementation
            .getDOMImplementation();

      // Create an instance of org.w3c.dom.Document.
      String svgNS = "http://www.w3.org/2000/svg";;
      Document document = domImpl.createDocument(svgNS, "svg", null);

      // Create an instance of the SVG Generator.
      SVGGraphics2D svgGenerator = new SVGGraphics2D(document);
      
      MyForm1 m1 = new MyForm1();
      MyForm2 m2 = new MyForm2();
      
      m1.draw(svgGenerator);
      m2.draw(svgGenerator);
      
      // Finally, stream out SVG to the standard output using
      // UTF-8 encoding.
      boolean useCSS = true; // we want to use CSS style attributes
      Writer out = new OutputStreamWriter(System.out, "UTF-8");
      svgGenerator.stream(out, useCSS); 
   }
}
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