Key legal question
Whether the subsidiary constitutional complaint was admissible and the appellants had standing.
Extracted holding
The complaint was admissible; the appellants were entitled to challenge the decision because they had participated below and had a legally protected interest under cantonal and federal citizenship law.
Extracted reasoning
They had an enforceable entitlement under cantonal law, and Art. 14 BüG also confers a sufficiently defined legal position for constitutional complaint standing.