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。
Within the Replace Media function the Content Information and Preservation Description Information (PDI) must not be altered.
保存描述信息中的固化信息保证内容信息在档案信息包的移动和存取过程中不会发生变化，保存描述信息需要类似信息来保护自身。
The PDI Fixity Information provides some assurance that the Content Information has not been altered as the AIP is moved and accessed. Similar information is needed to protect the PDI itself.
存档信息包(aip)有一系列完整的保存描述信息(PDI)和相关的内容信息。
The AIP has a complete set of PDI for the associated Content Information.
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