Questão jurídica principal
Whether the cantonal court arbitrarily held that only a nullity complaint, not an appeal, was available against incidental exequatur in summary debt-enforcement proceedings.
Decisão extraída
The interpretation was defensible and not arbitrary.
Fundamentação extraída
The cantonal provisions and preparatory materials did not clearly establish that appeal was open in this procedural setting; mere legal error would not suffice for arbitrariness.