Questão jurídica principal
Whether the cantonal judgment was a final, partial, or prejudicial decision
Decisão extraída
The judgment was not final or partial; it was a prejudicial decision because it resolved preliminary questions and remitted the case for further instruction and a new decision on modification.
Fundamentação extraída
The appellate court did not end the litigation. The nullity finding and symbolic restitution had no autonomous significance separate from the pending modification claim.