The following group codes apply to region entities.
| Region group codes |
|---|
| Group code | Description |
|---|
| 100 | Subclass marker (AcDbModelerGeometry) |
| 70 | Modeler format version number (currently = 1) |
| 1 | Proprietary data (multiple lines < 255 characters each) |
| 3 | Additional lines of proprietary data (if previous group 1 string is greater than 255 characters) (optional) |