Questione giuridica chiave
Whether the appeal could challenge alleged violations of the Hague Service Convention and related treaty rules on service abroad
Decisione estratta
Yes, those treaty-law objections were admissible on appeal in this civil dispute, but any constitutional complaints were not.
Motivazione estratta
In a civil case, federal and treaty law may be reviewed on appeal; treaty-compliant service was a necessary preliminary issue for the cantonal default procedure and thus reviewable.