| Name | Explanation | Allowed Values |
| label | Label of the edge | alphanumeric |
| fontsize | Size of the font | — |
| fontname | Name of the font | — |
| fontcolor | Color of the font | — |
| style | Style name | bold, dotted, filled, etc. |
| color | Color of the edge | white, black, blue, etc. |
| len | Length of the edge | — |
| dir | Direction of the edge | forward, back, both or none |
| decorate | Draws line that connects labels with their edges | 0 or 1 |
| id | Optional value to denote different edges | alphanumeric |