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PREMIS in METS: Die beiden Datenmodelle Matterhorn METS und Archivematica

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Vergleich zwischen den beiden Datenmodellen Matterhorn METS und Archivematica. Beide Modelle basieren auf METS / PREMIS, unterscheiden sich aber in der Syntax.

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PREMIS in METS: Die beiden Datenmodelle Matterhorn METS und Archivematica

  1. 1. PREMIS in METS: Die beiden Datenmodelle Matterhorn METS und Archivematica Nestor-Praktikertag 2018: Metadaten für die digitale Langzeitarchivierung und der Metadatenstandard PREMIS Frankfurt am Main, 6. Juni 2018 Dr. Tobias Wildi, t.wildi@docuteam.ch 1
  2. 2. METS 2
  3. 3. Was ist METS? Und was ist ein METS- Profil? • METS = Metadata Encoding and Transmission Standard Verwaltet durch die Library of Congress http://www.loc.gov/standards/mets/ • METS ist ein Containerformat, welcher geeignet ist, – um das Informationsmodell von OAIS abzubilden – um Informationspakete zu serialisieren (systemunabhängig als eigenständige Paket weiterzugeben) • Die konkrete Umsetzung von METS lässt grosse Flexibilität zu. In einem «Profil» wird im Detail beschrieben, – wie METS verwendet wird, – welche weiteren Standards eingebunden werden – wie diese Standards aufeinander abgestimmt werden. • http://www.loc.gov/standards/mets/mets-profiles.html 3
  4. 4. METS – Metadata Transmission and Encoding Standard 4
  5. 5. Matterhorn METS-Profil • Ist ein METS-Profil • Basiert auf METS, EAD und PREMIS 2.2 • Ko-Entwicklung Staatsarchiv Wallis (CH) und docuteam. • 2012 bei der Library of Congress registriert http://www.loc.gov/standards/mets/profiles/00000041.xml • Wird unterstützt durch die Open Source-Werkzeuge die docuteam für die digitale Archivierung entwickelt (docuteam packer, docuteam feeder) • Wird zunehmend auch als Ablieferungsformat genutzt und nicht durch docuteam-Werkzeuge gebildet. • Wird gegenwärtig weiterentwickelt zu «Matterhorn RDF», respektive «IP new generation», was in der Schweiz eCH-0160 ablösen soll. 5
  6. 6. Matterhorn METS-Profil bildet das OAIS-Informationsmodell ab 6 Representation Information Data Object (Dateien) Preservation Description Information Descriptive Information PREMIS PREMSI ISAD(G) à EAD METS (Metadata Encoding and Transmission Standard) Container
  7. 7. Archivematica 7 • Artefactual Systems, Inc., Toronto. • Artefactual ist mit Evelyn McLellan selber im PREMIS-Board vertreten • Archivematica bezeichnet sich als «Core Preservation System»: Bewertung, Ingest, Speicherung, Preservation Planning / Preservation Actions. • Open Source (GPL3). • Datenmodell basiert auf METS und Premis 2.2. Dokumentation: https://wiki.archivematica.org/METS
  8. 8. PREMIS in METS 8
  9. 9. Library of Congress: Using PREMIS with METS • Library of Congress: «Guidelines for using PREMIS with METS for exchange Revised September 17, 2008» https://www.loc.gov/standards/premis/guidelines-premismets.pdf • Library of Congress «Guidelines for using PREMIS with METS for exchange Revised January 2017» https://www.loc.gov/standards/premis/guidelines2017-premismets.pdf Folgende Punkte werden geregelt: 1. Using PREMIS in METS sections 2. Use of PREMIS container «Use of one amdSec with repeating subelements (techMD, etc.) or repeating amdSec for each METS subelement is an implementer’s preference. These are semantically equivalent» 3. Redundancies between PREMIS and METS 4. METS structMap and PREMIS structural relationship elements 5. METS ID/IDREF and PREMIS identifier elements 6. Use of METS profiles 9
  10. 10. Matterhorn METS – Einbetten von PREMISmets metsHdr dmdSec mdWrap EAD amdSec digiprovMD mdWrap PREMIS PREMIS:OBJECT PREMIS:EVENT PREMIS:AGENTfileSec structmap 10 Eine einzige amdSec für das gesamte Informationspaket Ein digiprovMD- Block pro Objekt
  11. 11. Archivematica – Einbetten von PREMIS mets metsHdr dmdSec amdSec techMD mdWrap PREMIS:OBJECT digiprovMD mdWrap PREMIS:EVENT PREMIS:AGENT fileSec structmap 11 Eine amdSec pro Objekt
  12. 12. Matterhorn METS: Eine amdSec für alle Objekte 12
  13. 13. Matterhorn METS Ein digiprovMD-Block pro Objekt • PREMIS-Informationen zu einem Ordner oder einer Datei werden je in einer digiprovMD-Sektion zusammengefasst 13
  14. 14. Archivematica: Eine amdSec pro Objekt 14
  15. 15. Archivematica: techMD und digiprovMD • techMD für PREMIS:OBJECT • digiprovMD für PREMIS:EVENT, PREMIS:AGENT 15
  16. 16. Redundanzen 16
  17. 17. Redundanzen zwischen METS und PREMIS LoC Implementation Guidelines: «An implementer may decide whether it is easier to include the information redundantly, based on how the data will be used and/or supplied. Implementers should consider the use of the metadata (e.g. display or preservation) and whether the METS (for display) or PREMIS (for preservation) is primary when deciding which to use and whether to record redundantly.» 17
  18. 18. Redundanzen: Beispiele • Beispiel Fixity Information (Checksumme): – <METS:file CHECKSUM=“[WERT]“ CHECKSUMTYPE=“[Wert]“> – <PREMIS:fixity> <messageDigestAlgorithm> <messageDigest> • Beispiel Dateiformat: – <METS:file MIMETYPE=“[Wert]“> – <PREMIS:formatDesignation> <formatName> <formatVersion> • Entscheid bei Matterhorn METS: – Fixity in PREMIS – MIME-Type in METS (display), weiterführende Beschreibung von Dateiformat und Version in PREMIS (preservation). 18
  19. 19. Events 19
  20. 20. Archivematica: Event • Pro Event wird geschrieben: – eventIdentifier – eventType – eventDateTime – eventDetail • eventOutcomeInformation • eventOutcome eventOucomeDetail – linkingAgentIdentifier • linkingAgentIdentifierType (eg. preservation system, repository code, Archivematica user) • linkingAgentIdentifierValue – kein linkingObjectIdentifier, der Event bezieht sich jeweils auf das Object in der gleichen amdSec 20
  21. 21. Matterhorn METS: Event • Pro Event wird geschrieben: – eventIdentifier – eventType (standardisiertes Vokabular, abgestimmt auf LoC-Vokabular) – eventDateTime (Timestamp) – eventDetail (hier auch textliche Beschreibung des Akteurs) – eventOutcomeInformation • eventOutcome (success/failure) • eventOucomeDetail – linkingObjectIdentifier • linkingObjetctIdentifierType • linkingObjectIdentifierValue 21
  22. 22. Matterhorn METS: Event-Typen • Die Event-Typen sind nicht Teil des METS-Profils. Verwendet werden folgende Typen: – Creation – Rename – Fixity Check – Deletion – Path Modification – Migration – Replace • Ausser “Replace” handelt es sich um Event Types aus dem Standardvokabular der Library of Congress: http://id.loc.gov/vocabulary/preservation/eventType.html 22
  23. 23. Matterhorn METS: Event 23
  24. 24. Vergleich und Fazit 24
  25. 25. Archivematica und Matterhorn METS Archivematica Matterhorn METS PREMIS 2.2 PREMIS in METS eingebettet und nicht nur verlinkt dezentralisiert: - Eine amdSec pro Objekt - Ein techMD-Block pro Objekt - Ein digiprovMD-Block pro Event, Agent zentralisiert: - Eine einzige amdSec pro Paket - Ein digiprovMD-Block pro Objekt kein registriertes METS-Profil METS-Profil: http://www.loc.gov/standards/mets/profi les/00000041.xml Loglevel in Archivematica: Detailliert, möglichst umfassende technische Metadaten Loglevel in docuteam feeder: Soviel wie nötig als Grundlage für Preservation Planning 25
  26. 26. Fazit • In den beiden Modellen werden praktisch identische Informationen kodiert. • Matterhorn METS zentral, Archivematica dezentralisiert. • LoC: «Use of one amdSec with repeating subelements (techMD, etc.) or repeating amdSec for each METS subelement is an implementer’s preference. These are semantically equivalent» • Dass unabhängig voneinander zwei Datenmodelle mit dieser hohen Ähnlichkeit entwickelt wurde zeigt, dass – die Standardisierungsdokumente hinreichend detailliert verfasst sind – die Implementation Guidelines der LoC praxisorientiert, umsetzbar und klar formuliert sind • Am Vergleich von Archivematica und Matterhorn METS zeigt sich, dass ein Produktwechsel zwar syntaktische Änderungen an den API nach sich ziehen würde, die Semantik sich aber gleich bleibt. 26

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