| Name | N | Rail name | String |
| Profile | P | Rail profile | Profile |
| Horizontal alignment | Ha | Rail horizontal alignment
0=Exterior, 1=Center, 2=Interior | Integer |
| Horizontal offset | Ho | Rail horizontal offset | Number |
| Vertical alignment | Va | Rail vertical alignment
0=Top, 1=Center, 2=Bottom | Integer |
| Vertical offset | Vo | Rail vertical offset | Number |
| Orientation | O | Rail orientation
0=Aligned, 1=Vertical | Integer |
| End style | Es | Rail end style
0=Plumb, 1=Square | Integer |
| End margin | Em | Rail end margin | Number |
| Planar joint | Jp | Rail planar joint
0=None, 1=Break, 2=Miter | Integer |
| Non planar joint | Jn | Rail non planar joint
0=None, 1=Break, 2=Miter, 3=Flat | Integer |
| Profile rotation | Pr | Rail profile rotation in radians | Number |