Kernrechtsfrage
Whether the public law appeal could challenge the cantonal court's method of calculating the husband's income
Extrahierter Entscheid
That criticism raised a federal-law issue that could have been brought by appeal on the merits and was therefore unavailable in public law appeal due to subsidiarity.
Extrahierte Begründung
Because the attack concerned the legal method of determining support capacity under Art. 125 CC, it was a matter for reform appeal, not a public law appeal.