Question juridique clé
Whether the administrative federal appeal was admissible against a cantonally based exception permit under spatial planning law.
Solution extraite
The administrative appeal was not admissible because the challenged exception permit rested on cantonal and communal law, not on directly applicable federal law.
Motifs extraits
Art. 23 RPG refers exception permits within the building zone to cantonal law and does not itself create an independent federal-law decision subject to administrative appeal.