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.
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。
With a referenced fixity, cooperative localization can be achieved by only a piece of PPLI information.
在有固定参照物的情况下，只需要一个PPLI定位信息就可以实现平台的协同定位。
With a referenced fixity, cooperative localization can be achieved by only a piece of PPLI information.
在有固定参照物的情况下，只需要一个PPLI定位信息就可以实现平台的协同定位。
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