In fact, with a parsed file wich contains elements, the methods works
fine, but if we add element (with id) to the Document then the methods
stucks...

You can try it.

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class Test20040302 {
  public static void main (String[] args) {
    try {
      DocumentBuilderFactory docBuilderFactory =
DocumentBuilderFactory.newInstance();
      DocumentBuilder docBuilder =
docBuilderFactory.newDocumentBuilder();
      Document xmlDocument = docBuilder.parse(args[0]);
      if (xmlDocument != null) {
        Element god = xmlDocument.getElementById("Kibo");
        if (god != null) {
          System.out.println(god.getAttribute("home"));
        }
        else {
          System.out.println("Element not found.");
        }
      }
    }
    catch (Exception e) {
      System.out.println(e);
    }
  }
}

Use it with a such file passe in argument

Code:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE gods [
  <!ELEMENT gods (god)+>
  <!ELEMENT god empty>
  <!ATTLIST god
    name ID #REQUIRED
    home CDATA #implied>
]>
<gods>
  <god name="Kibo" home="http://www.kibo.com/" />
  <god name="Xibo" />
</gods>


Then add a node after "Element god =
xmlDocument.getElementById("Kibo"); "
with this method. You won't be able to search for Butch with the same
method after.

Code:
static void addNode(Document doc) {
  Element elem = doc.createElement("god");
  elem.setAttribute("home", "GamerZ");
  elem.setAttribute("name", "Butch");
  ((Element)
doc.getElementsByTagName("gods").item(0)).appendChild(elem);

}