Federate official Belgium data sources

scripts/provision_belgium_north_sea_scope.py

@@ -99,6 +99,15 @@ AREA_NAMES = {
     "continental_shelf": "Belgian continental shelf beyond territorial sea",
 }
 
+THEME_BY_LAYER = {
+    "belgium_land_boundary": "administrative",
+    "belgium_regions": "administrative",
+    "belgium_provinces": "administrative",
+    "belgium_municipalities": "administrative",
+    "marine_legal_scopes": "marine_environment",
+    "marine_spatial_plan_2026": "maritime_planning",
+}
+
 
 def parse_args() -> argparse.Namespace:
     parser = argparse.ArgumentParser(description="Provision the Belgium and Belgian North Sea scope.")
@@ -656,6 +665,7 @@ def _upload_dataset(
     source_metadata = {
         "provider": source_name,
         "authority_level": "authoritative",
+        "theme": THEME_BY_LAYER[reference_layer_name],
         "coverage_zones": coverage_zones,
         "reference_layer_name": reference_layer_name,
         "source_url": source_url,