Hi Ronald, thanks for the reply.
Indeed that does what i need, at least logically. However in the exported gds file, the output is still a polygon. I need to have the structure defined as a path in the gds file itself due to requirements for some processes by a foundry. As far as i can tell Nazca always uses polygons or boxes, and i am wondering if there is a way of changing that? Or some methods that do output paths?
See example at http://s000.tinyupload.com/?file_id=90343711839218552542
In this case the upper structure is defined as a rectangle, while the lower one is defined as a path.