• Do you want to request a feature or report a bug?

Feature.

• What is the current behavior?

The loadflow validation tool does not know about extensions and cannot validate the behaviour of computations with respect with those extensions.

• What is the expected behavior?

It would be nice to be able to plug in the validation of "private" extensions into the validation tool. For example, if a loadflow handles a specific type of HVDC regulation, we could check that the result conforms to that regulation.

• What is the motivation / use case for changing the behavior?

Being able to fully validating results on networks which uses specific extensions for computations (HVDC regulations ...).