Questão jurídica principal
Whether a public-law appeal is admissible against revocation of an existing residence permit.
Decisão extraída
The ordinary public-law appeal is admissible because the case concerns revocation of an already granted permit with continuing legal effects; the subsidiary constitutional appeal is unavailable.
Fundamentação extraída
Although no entitlement may exist to initial issuance, revocation of an existing permit remains reviewable under the ordinary remedy where the permit would otherwise continue to have legal effect.