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すでに ID, 都道府県名の形式でデータベース管理しているプロジェクトをjp_prefectureで置き換えようとしたとき、各都道府県情報が JIS X 0402 とは異なったIDにより保存されてしまっている場合は置き換えられません。
このような状況でも、jp_prefecture を利用できるようにするため、下記のようなインターフェイスによって都道府県のマップ情報を再定義可能にしました。