eOpen = rb_define_class_under (cVT, "OpenError", eVT);
eInvalidData = rb_define_class_under (cVT, "InvalidDataError", eVT);
eInvalidComment = rb_define_class_under (cVT, "InvalidCommentError",
eOpen = rb_define_class_under (cVT, "OpenError", eVT);
eInvalidData = rb_define_class_under (cVT, "InvalidDataError", eVT);
eInvalidComment = rb_define_class_under (cVT, "InvalidCommentError",