The repository shall ensure that the PDI is persistently associated with the relevant Content Data Object.

APTrust ensures that PDI remains permanently associated with the Content Data Object by:

• Preserving original BagIt tag files as part of the AIP.
• Recording PREMIS events in preservation metadata attached to the intellectual object.
• Maintaining object and file relationships in the APTrust registry.
• Including complete PREMIS event histories in restored DIPs.

Because BagIt tag files and repository-generated preservation metadata are stored with and logically linked to the Content Data Object, PDI is not maintained separately from the objects it describes.

Also see APtrust Bagging Requirements, Ingest and Deletion documentation.