Bag ingest

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Feature description

Archivematica accepts transfers packaged in accordance with the Bagit specification.

Requirements

• All standard Bagit checks are run: verifyvalid, checkpayloadoxum, verifycomplete, verifypayloadmanifests, verifytagmanifests.
• Archivematica differentiates between mandatory and optional bag elements so that if optional elements are not present the bag does not fail the verification micro-service.
• The BagIt checks generate log files that will be added to the logs directory of the transfer.
• The BagIt file manifest (manifest-sha512.txt) is placed in the metadata directory of the transfer.
• The other BagIt files (bag-info.txt, bagit.txt, tagmanifest-md5.txt) will be placed in a logs/BagIt directory.
• No new PREMIS events are required. The BagIt checks are recorded as a fixity check in PREMIS.

Workflow

In this workflow diagram, the white ovals are manual steps and the grey ovals are automated steps.

Parse and index contents of bag-info.txt

• Enhancements being developed in 2015

Parse bag-info.txt contents to AIP METS file

• Labels in bag-info.txt file serialized as XML in METS sourceMD, linked to the objects directory of the AIP
• Sample bag-info.txt (from https://tools.ietf.org/html/draft-kunze-bagit-10:

Source-Organization: Spengler University
Organization-Address: 1400 Elm St., Cupertino, California, 95014
Contact-Name: Edna Janssen
Contact-Phone: +1 408-555-1212
Contact-Email: ej@spengler.edu
External-Description: Uncompressed greyscale TIFF images from the Yoshimuri papers colle...
Bagging-Date: 2008-01-15
External-Identifier: spengler_yoshimuri_001
Bag-Size: 260 GB
Payload-Oxum: 279164409832.1198
Bag-Group-Identifier: spengler_yoshimuri
Bag-Count: 1 of 15
Internal-Sender-Identifier: /storage/images/yoshimuri
Internal-Sender-Description: Uncompressed greyscale TIFFs created from microfilm and are...

• Sample AIP METS file result:

<mets:amdSec ID="amdSec_14">
  <mets:sourceMD ID="sourceMD_1">
    <mets:mdWrap MDTYPE="OTHER" OTHERMDTYPE="BagIt">
      <mets:xmlData>
        <transfer_metadata>
          <Source-Organization>Spengler University</Source-Organization>
          <Organization-Address>1400 Elm St., Cupertino, California, 95014</Organization-Address>
          <Contact-Name>Edna Janssen</Contact-Name>
          <Contact-Phone>+1 408-555-1212</Contact-Phone>
          <Contact-Email>ej@spengler.edu</Contact-Email>
          <External-Description> Uncompressed greyscale TIFF images from the Yoshimuri papers colle...</External-Description>
          <Bagging-Date>2008-01-15</Bagging-Date>
          <External-Identifier>spengler_yoshimuri_001</External-Identifier>
          <Bag-Size>260 GB</Bag-Size>
          <Payload-Oxum>279164409832.1198</Payload-Oxum>
          <Bag-Group-Identifier>spengler_yoshimuri</Bag-Group-Identifier>
          <Bag-Count>1 of 15</Bag-Count>
          <Internal-Sender-Identifier>/storage/images/yoshimuri</Internal-Sender-Identifier>
          <Internal-Sender-Description>Uncompressed greyscale TIFFs created from microfilm and are...</Internal-Sender-Description>
        </transfer_metadata>
      </mets:xmlData>
    </mets:mdWrap>
  </mets:sourceMD>
</mets:amdSec>

• When Bagit labels contain characters that are not valid XML labels, continue processing but print error message and skip labels with invalid content.

Search contents in archival storage tab

• Add keyword field "Transfer metadata" to drop-down menu in search. This will search all the contents of the bag-info.txt.
• May also want to add a specific sub-field if the users expect to search on it frequently. Eg "Bagging date"