Kernrechtsfrage
Whether the cantonal court arbitrarily interpreted cantonal Lugano-Convention implementation rules by holding that only a nullity complaint, not an appeal, was open against incident exequatur in summary debt-enforcement proceedings.
Extrahierter Entscheid
The interpretation was not shown to be arbitrary; the Federal Court found no clearly established cantonal rule proving the appellant's view.
Extrahierte Begründung
The legislative materials, cited practice, and doctrine did not clearly establish that Article 3 of the cantonal law necessarily opened an appeal also for incidental exequatur in mainlevée proceedings. The challenged interpretation was therefore defensible.