import java.io.*;import java.util.*;/** TestEdit Load/Save model - XML version. * Not written yet, but at least I thought of it. :-) * DOM will probably be a good approach here. */public class XamDataAccessorXML extends XamDataAccessor {	public XamDataAccessorXML() {		super();	}    /** load one file, given an open BufferedReader */    public Exam load(BufferedReader is) throws IOException {		throw new IllegalArgumentException(			"XamDataAccessorXML cannot yet LOAD files");		// TODO: use DOM to parse it.    }	public void save(PrintWriter out, Exam model) {		throw new IllegalArgumentException(			"XamDataAccessorXML cannot yet SAVE files");		// TODO convert to DOM, and end with		// tree.write(out);	}}