Kernrechtsfrage
Whether the appeal in public law matters was admissible against the refusal to renew the residence permit.
Extrahierter Entscheid
No admissible public-law appeal lay because neither federal nor international law conferred a right to the permit renewal on the facts before the cantonal court.
Extrahierte Begründung
Art. 83(c)(2) LTF bars such appeals where no enforceable entitlement exists; the former marriage did not create a right to renewal.