In 1992, an international conference of members of the World Heritage Convention held in Japan produced the "Nara Document on Authenticity." This declared that Japan's maintenance and replacement of wooden structures help preserve traditional skills, so that the previous definition of authenticity was expanded to include "reliability of the sources of relevant information."
一九九二年，世界遺產會員國在日本舉行國際會議，發表「奈良宣言」，認為日本木結構古蹟的修護替換，讓傳統技術得以保存，因而將過去真實性的定義擴大為「相關資訊來源的可信度」。