autocad_entity: autocad_region
Features with this value indicate an area geometry representation of region entities. This value is used by both the reader and the writer. Region entities may also be read as surfaces, if the reader parameter Read Region Entities as Areas is set to No. In that case, their autocad_entity value is autocad_surface instead of autocad_region.
For writing, region entities are preferentially created from features with various area geometry, but when that is not possible, then surfaces entities are created instead. If the area has complexity such as nested loops like a donut, it may be written as a surface entity rather than as a region. Some complex areas may be written as regions (RealDWG only).
There are no specific attributes related to region entities.