Questione giuridica chiave
Whether the Federal Court could hear an appeal against the cantonal evidentiary/interlocutory judgment under Art. 29 OJ.
Decisione estratta
The challenged decision was not a final judgment deciding the merits, but only an evidentiary/interlocutory order; federal appeal is available only against final judgments.
Motivazione estratta
According to settled practice, final judgments are only those that materially dispose of the main claim. Preparatory decisions, interlocutory orders, evidence judgments, and rulings on individual defenses do not qualify.