Difference between revisions of "Metadata elements"

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==PREMIS elements relating to derived objects==
 
==PREMIS elements relating to derived objects==
  
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Since AIPs are constructed from both original and normalized objects, we need to determine what PREMIS elements should be used to describe the normalized objects and their relationship to the originals.
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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.
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===Original file metadata===
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===Normalized file metadata===
  
 
{| border="1" cellpadding="10" cellspacing="0" width=90%
 
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|1.10 relationship
 
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|1.10.2 relationshipSubType
 
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|1.10.3 relatedObjectIdentification
 
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[[Category:Development documentation]]
 
[[Category:Development documentation]]
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__NOTOC__

Revision as of 17:53, 2 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:

  1. Using the InterPARES Chain of Preservation (COP) model and the CoP/PREMIS crosswalk to identify required elements for objects preserved by Archivematica
  2. Analyzing existing metadata in the Archivematica AIP log files and METS.xml file in order to map them to METS and PREMIS elements
  3. Comparing 1) to 2) in order to determine what gaps exist in Archivematica
  4. Filling in the gaps - eg by modifying workflow to produce and/or capture missing elements
  5. Structuring the required elements into the Repository eXchange Package (RXP) specification
  6. Determining what metadata belongs in the DIP(s)

Map of Archivematica 0.6 metadata to PREMIS elements

Source: /data/logs/MD5checksum.txt
Process: Produced when quarantine period expires. Provides checksums for each object in the SIP. Note that if zipped files are present, a checksum is generated for the zipped file and not for each object within it.
Description PREMIS entity PREMIS semantic unit PREMIS semantic component Sample value(s)
Checksum Object 1.5.2 Fixity 1.5.2.2 messageDigest 326e0206ae83f815e4be5f28464f6ac6
Source: /data/logs/filenameCleanup.log
Process: Produced when quarantine period expires, prior to unpacking of any zipped files. If prohibited characters were present in filenames, provides crosswalk between original and "cleaned up" filenames.
Description PREMIS entity PREMIS semantic unit PREMIS semantic component Sample value(s)
Original filename Object 1.6 originalName none Syllabus final.doc
Cleaned-up filename Event 2.5.2 eventOutcomeDetail 2.5.2.1 eventOutcomeDetailNote Syllabus_final.doc
Source: /data/logs/virusScan.log
Process: Produced when ingested files are scanned for viruses and malware
Description PREMIS entity PREMIS semantic unit PREMIS semantic component Sample value(s)
Scan result Event 2.5 eventOutcomeInformation 2.5.1 eventOutcome OK
Source: /data/logs/fileUUIDs.log
Process: Produced after prohibited characters are removed from filenames and any zipped files have been unpacked. Provides a crosswalk between cleaned-up filenames and UUIDs.
Description PREMIS entity PREMIS semantic unit PREMIS semantic component Sample value(s)
Universal unique identifier (UUID) Object 1.1 objectIdentifier 1.1.2 objectIdentifierValue 270bd067-0483-4c5f-bdec-f2cbd6e651aa
Source: /data/logs/FITS-[UUID]-[SIP].xml (FITS output reports)
Process: Produced when FITS tool identifies and validates formats and extracts technical metadata
FITS element PREMIS entity PREMIS semantic unit PREMIS semantic component Sample value(s)
format Object 1.5.4.1 formatDesignation 1.5.4.1.1 formatName
  • Tagged Image File Format
  • Waveform Audio
  • Microsoft Powerpoint Presentation
version Object 1.5.4.1 formatDesignation 1.5.4.1.2 formatVersion 6.0
externalIdentifier Object 1.5.4.2 formatRegistry 1.5.4.2.2 formatRegistryKey fmt/10
Size Object 1.5 objectCharacteristics 1.5.3 size 125968
ImageWidth (image files and video streams) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 2464
ImageHeight (image files and video streams) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 3248
SamplesPerPixel (image files and video streams) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 3
XResolution (image files and video streams) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 300
YResolution (image and video streams) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 300
duration (audio files and video files) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 0:2:26:16
bitDepth/bitsPerSample (image files, audio files, video streams) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 16
sampleRate (audio files) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 48000.0
channels (audio files) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 2
aes:channelAssignment (audio files) Object 1.4 significantProperties 1.4.2 significantPropertiesValue
  • channelNum="0" mapLocation="LEFT"
  • channelNum="1" mapLocation="RIGHT"
VideoFrameRate (video streams) Object 1.4 significantProperties 1.4.2 significantPropertiesValue
  • 30.0
  • 29.97 fps
AspectRatio (video streams) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 1:1
AudioFormat (audio streams in video files) Object 1.4 significantProperties 1.4.2 significantPropertiesValue raw
AudioChannels (audio streams in video files) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 2
AudioBitsPerSample (audio streams in video files) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 8
AudioSampleRate (audio streams in video files) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 44100
PageCount (text files, office documents, pdf files) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 16
WordCount (text files, office documents) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 876
Paragraphs (text files, office documents) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 19
Slides (presentation files) Object 1.4 significantProperties 1.4.2 significantPropertiesValue 27
Source: /data/logs/normalization.log
Process: Produced during normalization to preservation and access formats
Description PREMIS entity PREMIS semantic unit PREMIS semantic component Sample value(s)
Name of normalization tool Agent 3.2 agentName none FFmpeg version SVN-r19352-4:0.5+svn20090706-2ubuntu2.2
Event description Event 2.2 eventType none Normalizing
Processing status Event 2.5 eventOutcomeInformation 2.5.1 eventOutcome Processing completed
Normalization result Event 2.5.2 eventOutcomeDetail 2.5.2.1 eventOutcomeDetailNote
  • Already in preservation format. No need to normalize.
  • No default normalization tool defined.
  • 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
Source: /data/logs/MD5checksum.txtprepareAIP_check.log
Process: Produced after file normalization process. Checks that checksums for files in the SIP have not changed during normalization.
Description PREMIS entity PREMIS semantic unit PREMIS semantic component Sample value(s)
Pass/fail notification Event 2.5 eventOutcomeInformation 2.5.1 eventOutcome
  • PASSED
  • FAILED
Source: /data/logs/AIP.MD5checksum.txt
Process: Produced during BagIt process. Provides checksums for the AIP and for each original and normalized file in the AIP.
Description PREMIS entity PREMIS semantic unit PREMIS semantic component Sample value(s)
AIP checksum Object 1.5.2 Fixity 1.5.2.2 messageDigest 12b86e038bf0bddd5aba110c35f288b8
File checksum Object 1.5.2 Fixity 1.5.2.2 messageDigest 326e0206ae83f815e4be5f28464f6ac6



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
  • 1.5.4.1.1 formatName Yes
  • 1.5.4.2.1 formatRegistryName No
  • 1.5.4.2.2 formatRegistryKey Yes
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

Normalized 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 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 object)
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
Object 1.5.2 fixity 1.5.2.2 messageDigest


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