Difference between revisions of "Metadata elements"
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Revision as of 12:20, 9 September 2010
Main Page > Development > Development documentation > Metadata elements
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)
Proposed PREMIS metadata for original file
This table is a template for metadata elements for the original file. Please note the following:
- The significantProperties semantic unit would be repeated as needed to capture all the significant property data produced by FITS.
- For most files, the relationships semantic unit would be used twice: once for the preservation copy and once for the access copy
- The event elements included in this table are an example only; a real PREMIS file would contain information about numerous events
- There will be at least two agent entities: an organization, such as City of Vancouver Archives, and Archivematica. The organization would be the agent for manual events such as reviewing the SIP, while Archivematica would be the agent for automated events such as normalization.
| Semantic unit | Semantic component | Sample value(s) | Notes |
|---|---|---|---|
| objectIdentifier | objectIdentifierType | UUID | mandatory unit and component |
| objectIdentifier | objectIdentifierValue | 0db50321-6d7b-4291-89ec-a8b0adc1ff96 | mandatory unit and component |
| objectCategory | none | file | mandatory unit and component |
| significantProperties | significantPropertiesType | ImageWidth | repeatable semantic unit |
| significantProperties | significantPropertiesValue | 1024 | repeatable semantic unit |
| objectCharacteristics | compositionLevel | 0 | mandatory unit and component |
| objectCharacteristics/fixity | messageDigestAlgorithm | MD5 | |
| objectCharacteristics/fixity | messageDigest | e479688508922354bdab09bca60d8d0e | |
| objectCharacteristics/fixity | messageDigestOriginator | City of Vancouver Archives | |
| objectCharacteristics | size | 787510 | |
| objectCharacteristics/format/formatDesignation | formatName | Windows Bitmap | format is a mandatory unit; must use either formatDesignation or formatRegistry |
| objectCharacteristics/format/formatDesignation | formatVersion | 3.0 | format is a mandatory unit; must use either formatDesignation or formatRegistry |
| objectCharacteristics/format/formatRegistry | formatRegistryName | PRONOM | format is a mandatory unit; must use either formatDesignation or formatRegistry |
| objectCharacteristics/format/formatRegistry | formatRegistryKey | fmt/116 | format is a mandatory unit; must use either formatDesignation or formatRegistry |
| originalName | none | /SAE Project files/newsletters/20100223/cover image.bmp | |
| relationship | relationshipType | derivation | |
| relationship | relationshipSubType | is source of | |
| relationship/relatedObjectIdentification | relatedObjectIdentifierType | UUID | mandatory unit and component if there is a related object |
| relationship/relatedObjectIdentification | relatedObjectIdentifierValue | 270bd067-0483-4c5f-bdec-f2cbd6e651aa | mandatory unit and component if there is a related object |
| relationship/relatedEventIdentification | relatedEventIdentifierType | Archivematica ID | "For derivative relationships between objects relatedEventIdentification must be recorded." |
| relationship/relatedEventIdentification | relatedEventIdentifierValue | 006 | "For derivative relationships between objects relatedEventIdentification must be recorded." |
| eventIdentifier | eventIdentifierType | Archivematica ID | mandatory unit and component |
| eventIdentifier | eventIdentifierValue | 006 | mandatory unit and component |
| eventType | none | normalization | mandatory unit and component |
| eventDateTime | none | 2009-12-01T09:09:00-02:00 | mandatory unit and component |
| eventDetail | none | program=ImageMagick; version=6.6.4.0 | This element can be used to record information about software used and eliminates the need to have agent entities for software programs |
| eventOutcomeInformation | eventOutcome | normalization successful | |
| linkingAgentIdentifier | linkingAgentIdentifierType | preservation system | used to link an agent to an event; not mandatory but recommended |
| linkingAgentIdentifier | linkingAgentIdentifierValue | Archivematica-0.6 | used to link an agent to an event; not mandatory but recommended |
| agentIdentifier | agentIdentifierType | repository code | mandatory unit and component |
| agentIdentifier | agentIdentifierValue | CVA | mandatory unit and component |
| agentName | none | City of Vancouver Archives | |
| agentType | none | organization | |
| agentIdentifier | agentIdentifierType | preservation system | mandatory unit and component |
| agentIdentifier | agentIdentifierValue | Archivematica-0.6 | mandatory unit and component |
| agentName | none | Archivematica | |
| agentType | none | software |
Proposed PREMIS metadata for normalized file (preservation copy)
Unlike the table above, this table shows all the metadata elements that should appear for a normalized file. The two events recorded are creation and checksum generation.
| Semantic unit | Semantic component | Sample value(s) | Notes |
|---|---|---|---|
| objectIdentifier | objectIdentifierType | UUID | mandatory unit and component |
| objectIdentifier | objectIdentifierValue | 270bd067-0483-4c5f-bdec-f2cbd6e651aa | mandatory unit and component |
| objectCategory | none | file | mandatory unit and component |
| objectCharacteristics | compositionLevel | 0 | mandatory unit and component |
| objectCharacteristics/fixity | messageDigestAlgorithm | MD5 | |
| objectCharacteristics/fixity | messageDigest | e479688508922354bdab09bca60d8d0e | |
| objectCharacteristics/fixity | messageDigestOriginator | City of Vancouver Archives | |
| objectCharacteristics/format/formatDesignation | formatName | Tagged Image File Format | format is a mandatory unit; must use either formatDesignation or formatRegistry |
| objectCharacteristics/format/formatDesignation | formatVersion | 6.0 | format is a mandatory unit; must use either formatDesignation or formatRegistry |
| objectCharacteristics/format/formatRegistry | formatRegistryName | PRONOM | format is a mandatory unit; must use either formatDesignation or formatRegistry |
| objectCharacteristics/format/formatRegistry | formatRegistryKey | fmt/10 | format is a mandatory unit; must use either formatDesignation or formatRegistry |
| relationship | relationshipType | derivation | |
| relationship | relationshipSubType | has source | |
| relationship/relatedObjectIdentification | relatedObjectIdentifierType | UUID | |
| relationship/relatedObjectIdentification | relatedObjectIdentifierValue | 0db50321-6d7b-4291-89ec-a8b0adc1ff96 | |
| eventIdentifier | eventIdentifierType | Archivematica ID | mandatory unit and component |
| eventIdentifier | eventIdentifierValue | 006 | mandatory unit and component |
| eventType | none | creation | mandatory unit and component |
| eventDateTime | none | 2010-08-01T09:08:44-03:00 | mandatory unit and component |
| eventDetail | none | program=ImageMagick; version=6.6.4.0; command=%convertPath% %fileFullName% +compress %preservationFileDirectory%%fileTitle%.%preservationFormat% | |
| eventIdentifier | eventIdentifierType | Archivematica ID | mandatory unit and component |
| eventIdentifier | eventIdentifierValue | 002 | mandatory unit and component |
| eventType | none | message digest calculation | mandatory unit and component |
| eventDateTime | none | 2010-08-01T09:08:46-01:00 | mandatory unit and component |
| eventDetail | none | program="MD5deep"; version="3.6" | |
| linkingAgentIdentifier | linkingAgentIdentifierType | preservation system | used to link an agent to an event; not mandatory but recommended |
| linkingAgentIdentifier | linkingAgentIdentifierValue | Archivematica-0.6 | used to link an agent to an event; not mandatory but recommended |
| agentIdentifier | agentIdentifierType | preservation system | mandatory unit and component |
| agentIdentifier | agentIdentifierValue | Archivematica-0.6 | mandatory unit and component |
| agentName | none | Archivematica | |
| agentType | none | software |
Events requiring metadata
Receive SIP (SIP gets placed in 1-receiveSIP)
| Semantic unit | Semantic component | Sample value(s) | Notes |
|---|---|---|---|
| eventIdentifier | eventIdentifierType | Archivematica ID | |
| eventIdentifier | eventIdentifierValue | 001 | |
| eventType | none | capture | |
| eventDateTime | none | 2010-08-01T09:08:46-01:00 | |
| linkingAgentIdentifier | linkingAgentIdentifierType | repository ID | |
| linkingAgentIdentifier | linkingAgentIdentifierValue | CVA |
Check checksums
| Semantic unit | Semantic component | Sample value(s) | Notes |
|---|---|---|---|
| eventIdentifier | eventIdentifierType | Archivematica ID | |
| eventIdentifier | eventIdentifierValue | 003 | |
| eventType | none | fixity check | |
| eventDateTime | none | 2010-08-01T09:08:46-01:00 | |
| eventDetail | none | program=MD5deep; version=3.6 | |
| eventOutcomeInformation | eventOutcome | pass | |
| linkingAgentIdentifier | linkingAgentIdentifierType | repository system | |
| linkingAgentIdentifier | linkingAgentIdentifierValue | Archivematica-0.6 |
Generate checksums
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 |