{ "schema_version": "jp-election-municipality-proportional-swing-graph.v1", "dataset_id": "jp-election-db.derived-shape.graph", "family": "graph", "dataset": "municipality-proportional-swing-2025-2026", "source_release_version": "2026-05-03-v050", "point_grain": "municipality", "selector": { "prefecture_code": "", "prefecture_name": "", "prefecture_name_en": "", "region_id": "hokkaido", "region_name": "北海道地方", "region_name_en": "Hokkaido Region", "party_id": "ISH", "party_label": "維新", "party_label_en": "Japan Innovation Party (Ishin)", "scope": "region", "ranking_id": "", "ranking_label": "", "ranking_label_en": "" }, "comparison": { "comparison_key": "20250720_hc_pr__20260208_hr_block", "baseline_election_set_key": "20250720_hc", "baseline_election_date": "2025-07-20", "baseline_vote_system": "pr", "target_election_set_key": "20260208_hr", "target_election_date": "2026-02-08", "target_vote_system": "block" }, "metric": { "primary_metric_id": "votes_change_rate_pct", 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