Questão jurídica principal
Whether the subsidiary constitutional complaint was admissible despite no enforceable right to renewal of the residence permit.
Decisão extraída
The complaint was inadmissible because the appellant had no legal entitlement to renewal and could invoke only constitutional rights, which he did not substantiate properly.
Fundamentação extraída
Without a protected entitlement, ordinary public-law appeal was unavailable; the constitutional complaint required a concrete, substantiated allegation of a constitutional violation. The appellant's treu and faith argument was merely appellatory and attacked the merits, which he lacked standing to do under Art. 115 lit. b BGG.