public Track(Track track) { elt = new XMLElement(new Properties(), true, false); elt.setName("Track"); copy(track);
public Track(XMLElement elt, File dir) { this.elt = elt; this.dir = dir;
  public Track(Track track) {    elt = new XMLElement(new Properties(), true, false);    elt.setName("Track");    copy(track);  }