Question juridique clé
Whether the complaint against refusal to renew the residence permit was admissible as a public-law appeal.
Solution extraite
No admissible public-law appeal lay because residence permits were discretionary and the appellants showed no enforceable entitlement.
Motifs extraits
Discretionary residence permits under the applicable statutes do not confer a legal claim. No treaty-based entitlement or other right-bearing norm was invoked.