| coorlist | Chained list of coordinates |
| image_char_s | Char image data type |
| image_double_s | Double image data type |
| image_int_s | Int image data type |
| ntuple_list_s | 'list of n-tuple' data type |
| point | A point (or pixel) |
| rect | Rectangle structure: line segment with width |
| rect_iter | Rectangle points iterator |
1.3.4