Key legal question
Whether the applicants could challenge the refusal of a residence permit by constitutional complaint despite lacking an enforceable right to the permit.
Extracted holding
They had no enforceable entitlement to the requested residence permit, so ordinary public-law appeal was unavailable; only subsidiary constitutional complaint was conceivable.
Extracted reasoning
Without a legal claim to the permit, the applicants lacked standing to attack the substance of the administrative assessment and could only raise admissible constitutional grievances.