Question juridique clé
Whether the public-law appeal was admissible despite the immigration-law bar.
Solution extraite
The public-law appeal was admissible because the mother could invoke Article 8 ECHR, and the revoked permit would otherwise still have run until 12 September 2010.
Motifs extraits
No statutory or treaty right to a permit existed under the foreigner-law rules, but the family-life guarantee could be relied on due to the Swiss nationality of the child and the existing parent-child relationship; the appeal also remained open because it challenged a permit that would still have been valid absent revocation.