| comp1 | int | Number of component 1 ("object") for the difference contraint | | |
| comp2 | int | Number of component 2 ("object") for the difference contraint | | |
| diff_max | float | Maximum value of difference | | |
| diff_min | float | Minimum value of difference | | |
| name | str | Type of constraint (rel, abs, ratio, diff) | | meta.id |
| param | str | Name of parameter to constrain | | |
