Kernrechtsfrage
Whether IMES was entitled to file a federal administrative appeal against the cantonal decision
Extrahierter Entscheid
Yes. The federal office could appeal to secure uniform and correct application of federal immigration law, including challenging the cantonal court's recognition of a right to family reunification.
Extrahierte Begründung
A federal authority may use the appeal to contest a cantonal decision that unlawfully recognizes a federal-law entitlement; the appeal is not barred simply because the underlying permit would otherwise be discretionary.