Metadata elements
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This page identifies a minimum set of metadata elements designed to ensure authenticity and interoperability of preserved objects and to facilitate their retrieval.
This process involves:
- Using the InterPARES Chain of Preservation (COP) model and the CoP/PREMIS crosswalk to identify required elements for objects preserved by Archivematica
- Analyzing existing metadata in the Archivematica AIP log files and METS.xml file in order to map them to METS and PREMIS elements (see Existing elements)
- Comparing 1) to 2) in order to determine what gaps exist in Archivematica
- Filling in the gaps - eg by modifying workflow to produce and/or capture missing elements
- Structuring the required elements into the Repository eXchange Package (RXP) specification
- Determining what metadata belongs in the DIP(s)
Events requiring metadata
Receive SIP (SIP gets placed in 1-receiveSIP)
Metadata for the SIP as a whole
| Semantic component | Sample value(s) | Automated? | Notes |
|---|---|---|---|
| 2.1.1 eventIdentifierType | Y | ||
| 2.1.2 eventIdentifierValue | Y | ||
| 3.1.1 agentIdentifierType | user account | Y | |
| 3.1.2 agentIdentifierValue | demo | Y | |
| 3.1.1 agentIdentifierType | workstation id | Y | |
| 3.1.2 agentIdentifierValue | archivematica-1 | Y |
Check checksums
Metadata for each file in the SIP
| Semantic component | Sample value(s) | Automated? | Notes |
|---|---|---|---|
| 2.1.1 eventIdentifierType | Y | ||
| 2.1.2 eventIdentifierValue | Y | ||
| 2.2 eventType | Y | ||
| 2.3 eventDateTime | Y | ||
| 3.1.1 agentIdentifierType | software | Y | |
| 3.1.2 agentIdentifierValue | MD5sum | Y | |
| 2.5.1 eventOutcome | Pass; fail | Y | |
| 2.5.2 eventOutcomeDetail | j6059_02.wav FAILED | Y |
Generate checksums
Metadata for each file in the SIP for which a checksum is generated by Archivematica
| Semantic component | Sample value(s) | Automated? | Notes |
|---|---|---|---|
| 2.1.1 eventIdentifierType | Y | ||
| 2.1.2 eventIdentifierValue | Y | ||
| 2.2 eventType | Y | ||
| 2.3 eventDateTime | Y | ||
| 3.1.1 agentIdentifierType | software | Y | |
| 3.1.2 agentIdentifierValue | MD5sum | Y | |
| 1.5.2.1 messageDigestAlgorithm | MD5 | Y | |
| 1.5.2.2 messageDigest | fa10ee76a575bafe43335abf6cd60bae | Y | |
| 1.5.2.3 messageDigestOriginator | City of Vancouver | Y |
Review SIP
| Semantic component | Sample value(s) | Automated? | Notes |
|---|---|---|---|
| 2.1.1 eventIdentifierType | Y | ||
| 2.1.2 eventIdentifierValue | Y | ||
| 2.2 eventType | Y | ||
| 2.3 eventDateTime | Y | ||
| 3.1.1 agentIdentifierType | user account | Y | |
| 3.1.2 agentIdentifierValue | demo | Y | |
| 2.5.1 eventOutcome {pass; conditional pass} | {pass; conditional pass} | N | If it fails, it doesn't move on to become an AIP, so failure is not an option |
| 2.5.2 eventOutcomeDetail Some files missing; appraisal required | Some files missing; appraisal required | N | This field is mandatory if eventOutcome = conditional pass |
Quarantine SIP
-when it went in and when it came out
Unpack zipped files
-tool used, time unpacked, event outcome (successful?), map of zipped file to unzipped contents (map for each unzipped file + link to event)
Assign UUIDs
-the usual stuff, map from original name to UUID
Remove prohibited characters=
-the usual stuff, map from original name to sanitized name
Virus scan
-the usual stuff, result for each file (include eventOutcomeDetail to describe type of fail such as the type of malware found)
File characterization
-identification: format name, format version, registry name, registry key -validation: well formed? Valid?
Appraise SIP
-usual event stuff -event outcome (no files removed; some files removed) -list of files removed
Normalization to preservation formats
-everything already in the table plus identification information: format name, format version, registry name, registry key
Normalization to access formats
Mandatory PREMIS elements (mandatory semantic units + mandatory components)
| Entity | Semantic unit | Semantic component | Present in Archivematica? |
|---|---|---|---|
| Object | 1.1 objectIdentifier | 1.1.1 objectIdentifierType | No |
| Object | 1.1 objectIdentifier | 1.1.2 objectIdentifierValue | Yes |
| Object | 1.2 objectCategory | none | No |
| Object | 1.5 objectCharacteristics | 1.5.1 Composition level | No |
| Object | 1.5.4 objectCharacteristics/format | Either 1.5.4.1 formatDesignation or 1.5.4.2 formatRegistry must be used |
|
| Object | 1.7 Storage | Either 1.7.1 contentLocation or 1.7.2 storageMedium must be used. However, "if the preservation repository uses the objectIdentifier as a handle for retrieving data, contentLocation is implicit and does not need to be recorded." | No, but retrieval may be managed through UUIDs. |
| Event | 2.1 eventIdentifer | 2.1.1 eventIdentifierType | No |
| Event | 2.1 eventIdentifer | 2.1.2 eventIdentifierValue | No |
| Event | 2.2 eventType | none | Partial |
| Event | 2.3 eventDateTime | none | Partial |
| Agent | 3.1 agentIdentifier | 3.1.1 agentIdentifierType | No |
| Agent | 3.1 agentIdentifier | 3.1.2 agentIdentifierValue | No |
PREMIS elements relating to derived objects
Since AIPs are constructed from both original and normalized files, we need to determine what PREMIS elements should be used to describe the normalized files and their relationship to the originals.
Original file metadata
| Entity | Semantic unit | Semantic component | Example |
|---|---|---|---|
| Object | 1.10 relationship | 1.10.1 relationship type | derivation |
| Object | 1.10 relationship | 1.10.2 relationshipSubType | is source of |
| Object | 1.10.3 relatedObjectIdentification | 1.10.3.1 relatedObjectIdentifierType | UUID |
| Object | 1.10.3 relatedObjectIdentification | 1.10.3.2 relatedObjectIdentifierValue | (UUID of the normalized file) |
| Event | 2.1 eventIdentifer | 2.1.1 eventIdentifierType | |
| Event | 2.1 eventIdentifer | 2.1.2 eventIdentifierValue | |
| Event | 2.2 eventType | none | Normalization |
| Event | 2.3 eventDateTime | none | 2010:05:19 00:49:15+00:00 |
| Event | 2.5 eventOutcomeInformation | 2.5.1 eventOutcome | Processing completed |
| Event | 2.5.2 eventOutcomeDetail | 2.5.2.1 eventOutcomeDetailNote | Output #0, wav, to '/tmp/MultimediaSIP-9ece5881-640e-4bdc-9863-4ff50046a0bd/objects/sample.wav': Stream #0.0: Audio: pcm_s16le, 8000 Hz, stereo, s16, 256 kb/s |
| Agent | 3.1 agentIdentifier | 3.1.1 agentIdentifierType | |
| Agent | 3.1 agentIdentifier | 3.1.2 agentIdentifierValue | |
| Agent | 3.2 agentName | none | FFmpeg version SVN-r19352-4:0.5+svn20090706-2ubuntu2.2 |
Normalized file metadata
| Entity | Semantic unit | Semantic component | Example |
|---|---|---|---|
| Object | 1.1 objectIdentifier | 1.1.1 objectIdentifierType | UUID |
| Object | 1.1 objectIdentifier | 1.1.2 objectIdentifierValue | 270bd067-0483-4c5f-bdec-f2cbd6e651aa |
| Object | 1.10 relationship | 1.10.1 relationship type | derivation |
| Object | 1.10 relationship | 1.10.2 relationshipSubType | has source |
| Object | 1.10.3 relatedObjectIdentification | 1.10.3.1 relatedObjectIdentifierType | UUID |
| Object | 1.10.3 relatedObjectIdentification | 1.10.3.2 relatedObjectIdentifierValue | (UUID of the original file) |
| Object | 1.10.4 relatedEventIdentification | 1.10.4.1 relatedEventIdentifierType | |
| Object | 1.10.4 relatedEventIdentification | 1.10.4.2 relatedEventIdentifierValue | |
| Object | 1.5.2 fixity | 1.5.2.1 messageDigestAlgorithm | MD5 |
| Object | 1.5.2 fixity | 1.5.2.2 messageDigest | 537e0206ae83f815e4fg5f28464f6rt7 |