*/
protected void extractHeader( Matcher matcher )
{
final Integer version = Integer.parseInt( matcher.group( 1 ) );
final Header header = new Header( version );
final String commentToken = matcher.group( 2 );
if ( commentToken != null )
{
String text = matcher.group( 3 );
final Comment comment = new Comment ( text );
header.setComment( comment );
}
this.header = header;
}