protected Object deserializeUnknownHeader(DataInput is,int head,ElsaStack objectStack) throws IOException {
  throw new IOException("Unknown serialization header: " + head);
}

protected Object deserializeUnknownHeader ( DataInput is , int head , ElsaStack objectStack ) throws IOException { throw new IOException ( "Unknown serialization header: " + head ) ; }
override this method to extend elsaserializerbase functionality
