Questione giuridica chiave
Whether the public law appeal against the cantonal interlocutory decision refusing joinder was admissible.
Decisione estratta
Yes, because a refusal to allow joinder may be reviewed immediately in order to avoid useless repetition of the proceedings.
Motivazione estratta
The decision did not end the main case, but the Court departed from the usual finality rule for refusals of joinder because, if review were postponed, the case might have to be restarted with the third parties, contrary to procedural economy.