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Description : Enhancements to PREMIS

Tags : PREMIS

Published on : Apr 30, 2020
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Enhancements to PREMIS Presentation Transcript

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Enhancements to PREMIS

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What is digital preservation metadata? Digital preservation metadata = Metadata to ensure long-term accessibility of digital resources Digital objects must be self-descriptive Must be able to describe, manage and discover independently from the systems that were used to create them XML (machine and human readable) 1 May 2020 2

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Challenges Digital objects are dependent on technology Formats and environments are complex Format information and rendering information is needed Software Hardware Dependencies (stylesheets, fonts) Relationships Physical structural Logical structural 6 November 201 3

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The PREMIS standard Data Dictionary (PREMIS 3.0) http://www.loc.gov/standards/premis/v3/ Version 3 released June 2015 XML schema v2.3 (draft for 3.0 out for review) OWL ontology (revision planned) Supporting documentation Widely implemented, incorporated into open-source and commercial digital repository tools 6 November 201 4

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Entities: “things” relevant to digital preservation that are described by preservation metadata Relationships between Entities Properties of Entities (semantic units) Object Event Agent Rights identifiers identifiers identifiers identifiers identifiers Intellectual Entity Data Model in PREMIS Version 2 Representation File Bitstream Entity 6 November 201 5

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Levels of Object Representation: set of files, including structural metadata, that, taken together, constitute a complete rendering of an Intellectual Entity File: named and ordered sequence of bytes that is known by an operating system Bitstream: data within a file with properties relevant for preservation purposes (but needs additional structure or reformatting to be stand-alone file) 6 November 201 6

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Example: one content, 3 digital representations Intellectual entity  Representation 2 Files File Representation 3 Representation 1 … … Files Part1.pdf Part2.pdf Part3.pdf Partn.pdf Book.epub page1.tif page1.xml page2.tif page3.tif page2.xml page3.xml 6 November 201 7

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PREMIS: From V2 to V3 Improving PREMIS based on user needs Add preservationLevelType semantic unit Add agentVersion semantic unit Add “unknown” values Add eventDetailInformation semantic unit Add authority for controlled vocabulary Make Intellectual Entity an Object category Make Environments independent Objects Add physical Objects Update conformance statement 6 November 201 8 minor

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Changes in version 3:Add preservationLevelType semantic unit 1.3 preservationLevel 1.3.1 preservationLevelValue 1.3.2 preservationLevelRole 1.3.3 preservationLevelRationale 1.3.4 preservationLevelDateAssigned 9 6 November 201

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Changes in version 3:Add preservationLevelType semantic unit 1.3 preservationLevel 1.3.1 preservationLevelType 1.3.2 preservationLevelValue 1.3.3 preservationLevelRole 1.3.4 preservationLevelRationale 1.3.5 preservationLevelDateAssigned Associate type of preservation function with preservation level. 10 6 November 201

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objectIdentifier objectIdentifierType: ARK objectIdentifierValue: ark:/9999/c1 objectCategory: file preservationLevel preservationLevelType: Bit preservation preservationLevelValue: medium preservationLevel preservationLevelType: Functional preservation preservationLevelValue: migration objectCharacteristics compositionLevel: 0 size: 726970368 format formatDesignation format name: application/vnd.ms-excel 11 6 November 201

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Changes in version 3:Add agentVersion semantic unit If agentType is software, agentVersion can be used to refine agentName. 3.1 agentIdentifier 3.2 agentName 3.3 agentType 3.4 agentNote 3.5 agentExtension 3.6 linkingEventIdentifier 3.7 linkingRightsStatementIdentifier . 12 6 November 201

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Changes in version 3:Add agentVersion semantic unit If agentType is software, agentVersion can be used to refine agentName. 3.1 agentIdentifier 3.2 agentName 3.3 agentType 3.4 agentVersion 3.5 agentNote 3.6 agentExtension 3.7 linkingEventIdentifier 3.8 linkingRightsStatementIdentifier 3.9 linkingEnvironmentIdentifier 6 November 201 13

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Changes in version 3:Unknown compositionLevel and format compositionLevel and format: A value of unknown addedif the information is not available. 6 November 201 14

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Changes in version 3: Add eventDetailInformation semantic unit . 2.1 eventIdentifier 2.2 eventType 2.3 eventDateTime 2.4 eventDetail 2.5 eventOutcomeInformation 2.6 linkingAgentIdentifier 2.7 linkingObjectIdentifier 6 November 201 15

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Changes in version 3: Add eventDetailInformation semantic unit 2.1 eventIdentifier 2.2 eventType 2.3 eventDateTime 2.4 eventDetailInformation 2.4.1 eventDetail 2.4.2 eventDetailExtension 2.5 eventOutcomeInformation 2.6 linkingAgentIdentifier 2.7 linkingObjectIdentifier 6 November 201 16

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eventIdentifier: eventIdentifierType: UUID eventIdentifierValue: 908985d3-9600-4da4-a7e7-c6e9508bf24ceventType: validation eventDateTime: 2014-07-03T23:18:19eventDetailInformation: eventDetail: program="Jhove"; version="1.5"eventOutcomeInformation: eventOutcome: fail eventOutcomeDetail: eventOutcomeDetailNote: format="JPEG"; version="1.02"; result="Not well-formed“ capture compression creation deaccession decompression decryption deletion digital signature validation fixity check ingestion message digest calculation migration normalization replication validation virus check authority="premisEventType" authorityURI= "http://id.loc.gov/vocabulary/preservation/eventType.html" valueURI= "http://id.loc.gov/vocabulary/preservation/eventType/val.html Implementation specific change: Add authority for controlled vocabulary 6 November 201 18

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Changes in version 3: Make Intellectual Entity an Object category Event Agent Rights identifiers identifiers identifiers identifiers identifiers Intellectual Entity V2: Assumed to be held in a container metadata schema No Intellectual Entity semantic units Exception: identifier to enable linking to a description PREMIS Objects link to it. A set of content that is considered a single intellectual unit for purposes of management and description For example, a particular book, map, photograph, or database. Object Representation File Bitstream 6 November 201 20

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Changes in version 3: Make Intellectual Entity an Object category Event Agent Rights identifiers identifiers identifiers identifiers identifiers V3: Possibility to describe preservation aspects of intellectual entities Same semantic units as Representations Object Representation File Bitstream Intellectual Entity Representation File Bitstream 6 November 201 21

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Changes in version 3: Make Intellectual Entity an Object category Relate to PREMIS Events and RightsStatements. Support structural and derivative relationships with other IE Objects. Represent an aggregate, such as a collection, FRBR work, FRBR expression, fonds or series. Capture versioning information and metadata update events at the Intellectual Entity level Associate business requirements with them. Significant characteristics, risk definitions, guidelines for preservation actions, etc.. 6 November 201 22

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Representation Intellectual Entity relationshipType: structural relationshipSubType: represents File Like before, an intellectual entity can be represented as a representation, or directly as a single file or a single bitstream, skipping the intermediate Object types. Changes in version 3: Make Intellectual Entity an Object category An intellectual entity Object relates to other Objects through a relationship. An Intellectual Entity may have one or more digital representations. Representation Intellectual Entity File Bitstream 6 November 201 23

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Changes in version 3: Make Environments independent Objects What is needed to render or use an object Operating system Application software Hardware Computing resources A high-level data model Described as Intellectual Entities Preserved as Representation, File, Bitstream May be aggregate environment or individual components 6 November 201 24

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File File 2 relationshipType: dependency relationshipSubType: requires Software application Operating system Hardware architecture Hardware peripheral Software driver Software library Example: Environment stack and dependency relationships Modularised environment aggregates as a network Re-usable and distributed environment descriptions across different Objects across repositories and registries File 1 Repository Repository Registry 1 Registry 2 6 November 201 25

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Data Model in PREMIS V2 6 November 201 26 Object (including Environment semantic unit container) Event Agent Rights identifiers identifiers identifiers identifiers identifiers Intellectual Entity Environment

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Data Model in PREMIS V3 6 November 201 27 Object Environment Event Agent Rights identifiers identifiers identifiers identifiers identifiers identifiers

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Changes: Expanded relationship types for environment Objects Dependency Requires, is required by Is deployed on Derivation Is source of, has source Logical generalises, is generalised by Reference Documents, is documented in Replacements Supercedes, is superceded by Structural Includes, is included in Represents, is represented as 6 November 201 28

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Semantic units only applicable to environment Intellectual Entities 1.9 environmentFunction environmentFunctionType environmentFunctionLevel 1.10 environmentDesignation environmentName environmentVersion environmentOrigin environmentDesignationNote environmentDesignationExtension 1.11 environmentRegistry environmentRegistryName environmentRegistryKey environmentRegistryRole 1.12 environmentExtension 1.13 relationship … relatedEnvironmentPurpose relatedEnvironmentCharacteristic objectIdentifier objectIdentifierType: ARK objectIdentifierValue: ark:/9999/b1 objectCategory: intellectual entity environmentFunction environmentFunctionType: software environmentFunctionLevel: 1 environmentFunction environmentFunctionType: operating system environmentFunctionLevel: 2 XP Professional, Service Pack 3 6 November 201 29

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Semantic units only applicable to environment Intellectual Entities 1.9 environmentFunction environmentFunctionType environmentFunctionLevel 1.10 environmentDesignation environmentName environmentVersion environmentOrigin environmentDesignationNote environmentDesignationExtension 1.11 environmentRegistry environmentRegistryName environmentRegistryKey environmentRegistryRole 1.12 environmentExtension 1.13 relationship … relatedEnvironmentPurpose relatedEnvironmentCharacteristic objectCategory: intellectual entity environmentFunction environmentFunctionType: software environmentFunctionLevel: 1 environmentFunction environmentFunctionType: operating system environmentFunctionLevel: 2 environmentDesignation environmentName: Windows XP Professional environmentVersion: Service Pack 3 environmentDesignationNote: maintenance deadline: 2014-04 6 November 201 30

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Semantic units only applicable to environment Intellectual Entities 6 November 201 31 1.9 environmentFunction environmentFunctionType environmentFunctionLevel 1.10 environmentDesignation environmentName environmentVersion environmentOrigin environmentDesignationNote environmentDesignationExtension 1.11 environmentRegistry environmentRegistryName environmentRegistryKey environmentRegistryRole 1.12 environmentExtension 1.13 relationship … relatedEnvironmentPurpose relatedEnvironmentCharacteristic objectCategory: intellectual entity environmentFunction environmentFunctionType: software environmentFunctionLevel: 1 environmentFunction environmentFunctionType: operating system environmentFunctionLevel: 2 environmentDesignation environmentName: Windows XP Professional environmentVersion: Service Pack 3 environmentRegistry environmentRegistryName: PRONOM environmentRegistryKey: x-sfw/8 environmentRegistryRole: identity

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Semantic units only applicable to environment Intellectual Entities 1.9 environmentFunction environmentFunctionType environmentFunctionLevel 1.10 environmentDesignation environmentName environmentVersion environmentOrigin environmentDesignationNote environmentDesignationExtension 1.11 environmentRegistry environmentRegistryName environmentRegistryKey environmentRegistryRole 1.12 environmentExtension 1.13 relationship … relatedEnvironmentPurpose relatedEnvironmentCharacteristic Content Object relationshipType: dependency relationshipSubType: requires relatedEnvironmentPurpose: render relatedEnvironmentCharacteristic: recommended relatedObjectIdentifier relatedObjectIdentifierType: PUID relatedObjectIdentifierValue: x-sfw/8 x-sfw/8 Description of Windows XP Professional in PRONOM Alternative: Link to an external registry 6 November 201 32

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6 November 201 34 1.9 environmentFunction environmentFunctionType environmentFunctionLevel 1.10 environmentDesignation environmentName environmentVersion environmentOrigin environmentDesignationNote environmentDesignationExtension 1.11 environmentRegistry environmentRegistryName environmentRegistryKey environmentRegistryRole 1.12 environmentExtension 1.13 relationship … relatedEnvironmentPurpose relatedEnvironmentCharacteristic objectCategory: intellectual entity environmentFunction environmentFunctionType: software application Firefox 10.0 objectCategory: intellectual entity environmentFunction environmentFunctionType: software application BlueGriffon 1.6 Content Object formatName: text/html relationshipType: dependency relationshipSubType: requires relatedEnvironmentPurpose render relatedEnvironmentCharacteristic: known to work relationshipType: dependency relationshipSubType : requires relatedEnvironmentPurpose: create

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Changes in version 3: Add physical Objects A physical Object is A content Object, such as a manuscript, or printed document An environment Object, such as a physical hardware device. Representation: A digital or physical Object Either one instantiates or embodies an Intellectual Entity Digital and non-digital Objects can be captured uniformly. Physical Objects can relate to digital Objects and other physical Objects. In V3 storage is applicable to Representations. For physical Representations: the physical location, e.g. a shelf location. 6 November 201 35

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Changes in version 3: Add physical Objects 6 November 201 36 [Physical representation] objectIdentifier objectIdentifierType: ARK objectIdentifierValue: ark:/9999/h1.version1 objectCategory: file format formatDesignation formatName: image/tiff formatVersion: 6.0 objectIdentifier objectIdentifierType: ARK objectIdentifierValue::ark:/12148/cb37367035f objectCategory: intellectual entity relationshipType: derivation relationshipSubType: has source relatedObjectIdentifier relatedObjectIdentifierType: Internal call number relatedObjectIdentifierValue: Rés. Ye-3535 relationshipType: structural relationshipSubType: is represented as

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Implementing version 3 Finalize XML schema (draft under review) Revise RDF ontology Revise PREMIS in METS guidelines Add and revise controlled vocabularies at http://id.loc.gov Implement in preservation repository systems Experiment Collaborate to compile best practices 6 November 201 38

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