// Year
AppleRecordingYearBox year = getOrNull(apple, AppleRecordingYearBox.class);
addMetadata(XMPDM.RELEASE_DATE, metadata, year);
// Track number
AppleTrackNumberBox trackNum = getOrNull(apple, AppleTrackNumberBox.class);
if (trackNum != null) {
metadata.set(XMPDM.TRACK_NUMBER, trackNum.getTrackNumber());
//metadata.set(XMPDM.NUMBER_OF_TRACKS, trackNum.getNumberOfTracks()); // TODO
}
// Comment
AppleCommentBox comment = getOrNull(apple, AppleCommentBox.class);