schema_version: "jp-election-derived-shape-current.v1"
dataset: "municipality-boundary-geoshape-2020"
family: "municipality-boundary"
source_layer: "derived/shape/geo"
latest_dir: products/jp-election/derived/shape/geo/municipality-boundary-geoshape-2020/latest
source_release_version: "geoshape-2020-graph-shard-2026-04-25"
notes: "Graph-local municipality boundary shards from Geoshape static GeoJSON. Used only for public choropleth rendering."
artifacts:
  - artifact_id: "catalog"
    path: products/jp-election/derived/shape/geo/municipality-boundary-geoshape-2020/latest/catalog.json
    format: "json"
    notes: "Boundary shard catalog."
selectors:
  primary_selector_field: "prefecture_code"
  secondary_selector_field: "region_id"
  row_grain: "prefecture_code or region_id x source boundary feature mapped to graph jis_code"
  join_key: "properties.jis_code"