Presentation on theme: "A Daunting PREMIS: Implementing Preservation Metadata within the METS Framework Jerome P. McDonough Graduate School of Library & Information Science, UIUC."— Presentation transcript:
A Daunting PREMIS: Implementing Preservation Metadata within the METS Framework Jerome P. McDonough Graduate School of Library & Information Science, UIUC ICDAT 2006 Inst. of Information Science, Academia Sinica October 19, 2006
One Great Loss for Mankind
Source: Sarkissian, John M. (21 May 2006). The Search for the Apollo 11 SSTV Tapes. Parkes, Australia: CSIRO Parkes Observatory.
“Houston, we’ve had a problem here.” Loss of data due to format conversions Need to insure viable access to playback devices for media Inadequacy of traditional archival practice for insuring item-level access to media Need to detailed event history to document life-cycle/provenance of information
History of PREMIS OCLC/RLG Preservation Metadata Framework Working Group ( ) “…to define the concept of preservation metadata…and evaluate the prospects for a community-wide, consensus-building activity….” Final Report: Preservation Metadata for Digital Objects: A Review of the State of the ArtPreservation Metadata for Digital Objects: A Review of the State of the Art “…to develop a framework outlining the types of information -- i.e., metadata -- that should be associated with an archived digital object.” Final Report: A Metadata Framework to Support the Preservation of Digital ObjectsA Metadata Framework to Support the Preservation of Digital Objects
History of PREMIS PREservation Metadata Implementation Strategies [PREMIS] ( ) “Develop a core preservation metadata set, supported by a data dictionary, with broad applicability across the digital preservation community.” “Identify and evaluate alternative strategies for encoding, storing, and managing preservation metadata in digital preservation systems.” Final Report: Data Dictionary for Preservation Metadata: Final Report of the PREMIS Working GroupData Dictionary for Preservation Metadata: Final Report of the PREMIS Working Group PREMIS Maintenance Activity at Library of Congress, including XML Schema PREMIS Maintenance ActivityXML Schema
PREMIS Data Model
PREMIS Data Dictionary: Object Object Identifier Preservation Level Object Category Object Characteristics Creating Application Original Name Storage Environment Signature Information Relationship Linking Event Identifier Linking Intellectual Entity Identifier Linking Permission Statement Identifier An Object can be associated with one or more Rights statements, can participate in one or more Events, and can be related to one or more Agents
PREMIS Data Dictionary: Event Event Identifier Event Type Event Date & Time Event Detail Event Outcome Linking Agent Identifier Linking Object Identifier An Event must be related to one or more objects, and can be related to one or more Agents.
PREMIS Data Dictionary: Agent Agent Identifier Agent Name Agent Type An Agent may hold or grant one or more rights, may carry out, authorize, or compel one or more events, and may create or act upon one or more objects.
Overview of METS Digital Library Federation Initiative launched in 2001 as successor to Making of America II projectMaking of America II Goal: Create a single document format for encoding digital library objects which can fulfill roles of SIP, AIP and DIP within the OAIS reference model Scope limited to objects comprised of text, image, audio and video files (or combination thereof) METS Maintenance Activity at Library of Congress, including XML Schema METS Maintenance Activity XML Schema
METS Structure Object modeled as tree (e.g. movie is composed of scenes, which are composed of one or more shots) Every node in tree structure can be associated with content files and descriptive & administrative metadata Every content file can be associated with descriptive & administrative metadata
METS Administrative Metadata 4 Types: Technical, Rights, Source Document, Digital Provenance Non-prescriptive/Multiple instances may be internal (XML or binary) or external (XLink) to METS document Internal XML reliant on extension schema (e.g., PREMIS) for support
METS & PREMIS
OAIS Information Package
On-going Issues Architecting objects for performance, or the Metadata that Ate Cincinnati Organizing successful & complete representation networks Enabling trustworthy metadata Supporting ‘non-generic’ Event, Rights & Agent metadata Creating metrics & methods for evaluating digital preservation activities
The Metadata That Ate Cincinnati Add a 300 page digitized book with TIFF page images, a TEI encoding and a METS wrapper to your repository: 302 PREMIS Object Records, 302 Other Technical Metadata Records, 1 Descriptive Metadata Record, 1 Rights Record, 1 PREMIS Event Record (Ingest), 1 PREMIS Agent Record (Ingesting Agent), 302 PREMIS Event Records (JHOVE Validation) Migrate TIFF to JPEG2000 Add 300 PREMIS Event Records, 300 Additional Event Detail Records, 1 PREMIS Agent Record 300 PREMIS Object records, 300 Technical Metadata Records Run Fixity Check on Content Files Add 302 PREMIS Event Records, 1 PREMIS Agent Record Continue ad infinitum….
Representation Networks ISO/IEC :2004/PDAM 1 (JPEG Amendment 1/profiles for Dig. Cinema) SMPTE 384M (MXF) W3C XML 1.1 SMPTE 372M EBU Standard N AES SMPTE 196E ISO/IEC 15948:2004 (PNG) Unicode version SMPTE 12M (auxiliary file format) SMPTE 336M (KLV) ISO (ISAN) SMPTE 330M-2004 (UMID) ITU-T Recommendation X.509 ISO 3166 (language code) TIA-442 (RS-422) IEEE802.3 Partial (first layer) representation network for Digital Cinema System Specification
Trustworthy Metadata Metadata from a known (and trusted) source Metadata that has not experienced unauthorized change Metadata that is accurate Metadata that is sufficient to need Metadata that is transparent
Generic vs. Specific: Events, Rights & Agents Event Example -- Migrate SD DTV to HD DTV. You may want to know: De-interlacing technique (motion-compensated or not, linear or non-linear) Colorspace conversion (gamma correction, luma equations for source and destination, primary chromaticities and white points for source and destination) Aspect ratio conversion technique Similarly, we may want to know more about Rights and Agents than the minimal generic information
Evaluating Digital Preservation Programs What does it mean to preserve digital content? Does the meaning of “preservation” vary with context? What metrics should we employ to evaluate the success of a digital preservation program?
謝謝 ! Jerome McDonough Graduation School of Library & Information Science University of Illinois at Urbana-Champaign 501 E. Daniel Street, MC-493 Champaign, IL