Factory interface to create new 
DOMBuilder and DOMWriter
implementations. 
Java Binding:
package org.w3c.dom.loadSave;
public interface DOMImplementationLS {
    public DOMBuilder createDOMBuilder();
    public DOMWriter  createDOMWriter();
}
IDL:
  interface DOMImplementationLS {
    DOMBuilder  createDOMBuilder();
    DOMWriter   createDOMWriter();
  };