International exchanges are used to acquire official materials of foreign government offices that are difficult to obtain from the national and parliamentary libraries of other countries, as an exchange primarily for copies of materials published by the government and municipal agencies of Japan, whose copies have been acquired through the Legal Deposit System.
国際交換は、他国の国立図書館・議会図書館に対し、納本制度によって複数部が受け入れられた官公庁出版物を主に提供することにより、交換で入手の難しい外国の官公庁資料等を収集するのに用いられている。