Questione giuridica chiave
Whether the federal appeal against the cantonal interlocutory ruling on counterclaim jurisdiction was admissible.
Decisione estratta
The appeal was admissible as a federal-law challenge to territorial jurisdiction under Art. 49 OG, even though the disputed ruling was interlocutory.
Motivazione estratta
A decision declaring a counterclaim inadmissible is not a final decision, but a separate jurisdictional interlocutory decision; the appeal may be brought for alleged violation of federal rules on territorial jurisdiction.