AIP structure

This page documents the structure of the AIP produced by Archivematica.

Name

The AIP name is composed of the following:

1. Either the name of the original transfer if no new name has been assigned to the SIP upon formation or the name of the SIP or SIPs created from the transfer and

  1. a UUID assigned during SIP formation

example: Pictures_of_my_cat-aebbfc44-9f2e-4351-bcfb-bb80d4914112

“Pictures_of_my_cat” is the name assigned by the user and “aebbfc44-9f2e-4351-bcfb-bb80d4914112” is the UUID generated during SIP formation.

Directory structure

The AIP is zipped in the AIPsStore. The AIP directories are broken down into UUID quad directories for efficient storage and retrieval.

AIP directory - top level

AIP directory - top level

Note

UUID quad directories: Some file systems limit the number of items allowed in a directory, so Archivematica uses a directory tree structure to store AIPs. The tree is based on the AIP UUIDs. The UUID is broken down into manageable 4 character pieces, or “UUID quads”, each quad representing a directory. The first four characters (UUID quad) of the AIP UUID will compose a sub directory of the AIP storage. The second UUID quad will be the name of a sub directory of the first, and so on and so forth, until the last four characters (last UUID Quad) create the leaf of the AIP store directory tree, and the AIP with that UUID resides in that directory.)

Bagit documentation

The AIP is packaged in accordance with the Library of Congress Bagit specification (PDF, 84KB) As shown below, the BagIt files are bag-info.txt, bagit.txt, manifest-sha512.txt and tagmanifest-md5.txt:

Bagit specification files

The following describes the contents of the AIP once extracted:

Data directory

The data directory consists of the METS file for the AIP and three folders: logs, objects. and thumbnails.

AIP data directory

AIP data directory

METS file

/data/METS.uuid.xml contains the full PREMIS implementation (see PREMIS metadata for original file, PREMIS metadata: normalized files, PREMIS metadata: events, and PREMIS metadata: rights The role of the METS file is to link original objects to their preservation copies and to their descriptions and submission documentation, as well as to link PREMIS metadata to the objects in the AIP.

Logs

/data/logs contains the /transfers directory, normalization log, malware scan log, and the extraction log (from unpackaging packages) generated during SIP creation.

Logs folder content in Data

Logs folder content in Data

The /transfers directory contains the logs from processing that occurred to each transfer which is part of the SIP in the transfer workflow in the dashboard.

Objects

/data/objects contains original objects, normalized objects, /metadata and /submissionDocumentation. If there were any lower level directories within the SIP, that directory structure is maintained.

Objects folder content in Data

Objects folder content in Data

/metadata contains /transfers, which contains any metadata which may have been imported with the transfers

/submissionDocumentation contains submission documentation for each transfer which is part of the SIP and each transfer’s METS.xml file. The structmap for the transfer is the closest approximation of original order for the transfer, along with the tree diagram if the user chose to create one during transfer.

Thumbnails

/data/thumbnails contains any thumbnails generated for viewing in the AIP search interface of the dashboard.

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Archivematica 1.4

License

Archivematica documentation by Artefactual Systems Inc. is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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