ther cases may not be so straightforward. A 
familiar mechanism from the world of traditional materials in libraries and archives is an 
accessions or acquisitions register that is independent of other catalog metadata. A repository 
should be able to show, for each item in its accessions register, which AIP(s) contain content 
from that item. Alternatively, it may need to show that there is no AIP for an item, either 
because ingest is still in progress, or because the item was rejected for some reason. 
C