Key legal question
Whether the perimeter opening decision was a final or merely interlocutory decision for federal appeal purposes.
Extracted holding
The opening decision was a final decision because, under cantonal law, it definitively determines the procedure, perimeter, and cost shares independently of the later cost-division stage.
Extracted reasoning
The Court used a formal criterion: a decision is final if it ends the procedure. Here, the opening decision under cantonal rules conclusively fixed the contribution procedure and was not merely ancillary to a later main proceeding.