Within the Replace Media function the Content Information and Preservation Description Information (PDI) must not be altered.

在替换介质功能中，内容信息和保存描述信息(PDI)绝对不能改变。

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Archival Information Package (AIP) : an Information Package, consisting of the Content Information and the associated Preservation Description Information (PDI), which is preserved within an OAIS.

存档信息包(aip)：保存在OAIS中的，由内容信息和相关的保存描述信息(PDI)组成的信息包。

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