Kernrechtsfrage
Whether the public-law appeal was admissible as a matter of law against the refusal to renew a student residence permit.
Extrahierter Entscheid
The filing was manifestly inadmissible as a public-law appeal because the appellant had no federal or treaty-based entitlement to renewal of the permit.
Extrahierte Begründung
Without a legally protected right to renewal, the ordinary public-law route was excluded.