The PREMIS Working Group-Preservation Metadatafor Digital .ppt

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1、The PREMIS Working Group: Preservation Metadata for Digital Repositories,DLF Fall Forum October 26, 2004Rebecca Guenther LC/NDMSO rgueloc.gov,Oct. 26, 2004,DLF-PREMIS,2,Preservation Metadata Functions,Information that supports and documents the digital preservation process: Establish provenance: tra

2、ck chain of custody and alterations over time Details authenticity Documents technical processes object has undergone Describes technical details of object Describes the environment from which it originated Specify rights management information,Oct. 26, 2004,DLF-PREMIS,3,Preservation Metadata Functi

3、ons (cont.),Provide information to maintain resources over the long term: viability: objects bitstream is intact renderability: object can be translated to a form that can be viewed or used understandability: rendered content can be interpreted and understood,Oct. 26, 2004,DLF-PREMIS,4,Background,Ma

4、rch 2000: OCLC and RLG jointly sponsor international working group on preservation metadata Identify key issues/challenges Seek consensus on recommendations and best practiceWhite paper (January 2001) Defined preservation metadata; role in preservation process Reviewed/synthesized existing preservat

5、ion metadata schemesPreservation metadata framework (June 2002) Comprehensive description of types of information constituting preservation metadata Based on OAIS information model Set of “prototype” preservation metadata elements,Oct. 26, 2004,DLF-PREMIS,5,Aftermath ,Framework Consolidated expertis

6、e Provided foundation for developing formal preservation metadata specifications Common departure point for different schema implementationsBut . further scope for collaboration in preservation metadata Needed best practices/recommendations for implementing preservation metadata in real world digita

7、l archiving systems,Oct. 26, 2004,DLF-PREMIS,6,Issues unresolved in WG,How minimal is a core preservation metadata element set? How much metadata can be generated automatically? Is it useful to apply metadata elements by object type or object behavior? Levels of granularity not addressed Need to pro

8、vide less abstract view of preservation metadata for implementation,Oct. 26, 2004,DLF-PREMIS,7,PREMIS,June 2003: OCLC and RLG sponsored new working group: PREMIS Preservation Metadata: Implementation StrategiesObjectives Define “core” set of preservation metadata elements, with supporting data dicti

9、onary, applicable to broad range of digital preservation activities Identify and evaluate alternative strategies for encoding, storing, managing, and exchanging preservation metadata,Oct. 26, 2004,DLF-PREMIS,8,Membership,Priscilla Caplan, FCLA (Chair) Rebecca Guenther, LC (Chair) Michael Alexander,

10、British Library George Barnum, GPO Charles Blair, U. of Chicago Olaf Brandt, U. of Gottingen Adam Farquhar, British Library David Gewirtz, Yale Kevin Glavash, MIT/Dspace Cathy Hartman, U. of N. Texas Helen Hodgart, British Library Nancy Hoebelheinrich, Stanford Roger Howard/Sally Hubbard, Getty Muse

11、um Pam Kircher, OCLC John Kunze, Calif. Digital Library,Brian Lavoie, OCLC liaison Robin Dale, RLG liaison Vicky McCarger, LA Times Jerry McDonough, NYU/METS Evan Owens, JSTOR Erin Rhodes, NARA Madi Solomon, Walt Disney Co. Angela Spinazze, ATSPIN Stefan Strathmann, U. of Gottingen Gunter Waibel, RL

12、G Lisa Weber, NARA Robin Wendler, Harvard Hilde van Wijngaarden, KB Andrew Wilson, NAA,Oct. 26, 2004,DLF-PREMIS,9,Advisory Committee,Howard Besser, UCLA Liz Bishoff, OCLC (via Colorado Digitization Program) Gerard Clifton, National Library of Australia Gail Hodge, CENDI Steve Knight, National Librar

13、y of New Zealand,Maggie Jones, Digital Preservation Coalition Nancy McGovern, Cornell Cliff Morgan, Wiley UK Richard Rinehart, U. of California, Berkeley,Oct. 26, 2004,DLF-PREMIS,10,PREMIS Subgroups,Core elements Establish core metadata elements and data dictionary Developed a data model Has had 2 f

14、ace-to-face meetings Weekly conference calls Implementation Examine alternative strategies for encoding, storage and management of preservation metadata Conducted a survey of practices Monthly conference call Expect to complete activities by end of 2004,Oct. 26, 2004,DLF-PREMIS,11,Core elements subg

15、roup,Development of data model Objects Events Agents Intellectual entities Rights Data dictionary structured according to entities,Oct. 26, 2004,DLF-PREMIS,12,Core Elements,Conducting element-by-element review of prototype elements from metadata framework Is the element “core”? How is it being used

16、at WG members institutions? How should it be implemented/populated? Elements not covered by the framework?,Oct. 26, 2004,DLF-PREMIS,13,Objects,Identifiers Location Descriptive metadata out of scope Technical metadata not specific to particular file format Levels of objects: representation, file, fil

17、estream, bitstream,Oct. 26, 2004,DLF-PREMIS,14,Objects: Technical metadata,Object characteristics Fixity Size Format (including link to format registry) Inhibitors Significant properties Creating application information Environment (software, hardware) Externally defined technical metadata (e.g. Z39

18、.87/MIX),Oct. 26, 2004,DLF-PREMIS,15,Events,Digital provenance/process information Actions that involve one or more objects May be related to one or more agents Semantic units Event identifier Event type Event outcome Event detail Event date/time,Oct. 26, 2004,DLF-PREMIS,16,Agents,Agent descriptions

19、 out of scope Attributes of agents associated with preservation events and rights management May carry-out, authorize, or compel one or more events may create or act upon one or more objects may hold or grant one or more rights Semantic units Agent identifier Agent name,Oct. 26, 2004,DLF-PREMIS,17,R

20、ights and relationships,Rights Only in context of right to preserve Collecting rights use cases Relationships Data model expresses relationships between entities Relationships between objects Derivative, dependency, structural,Oct. 26, 2004,DLF-PREMIS,20,Implementation Strategies subgroup,Conducted

21、survey of preservation repositories to explore the state of the art Questions about policies, governance, funding, system architecture, preservation strategies, metadata implementation 70 surveys sent Responses from 28 libraries, 7 archives, 14 other in 13 different countries 10 national libraries,

22、6 national archives Survey published Oct. 2004,Oct. 26, 2004,DLF-PREMIS,21,Survey findings,Little experience with digital preservation Most didnt have active preservation strategy Many not yet in production Cannot assess adequacy of metadata Lack of common vocabulary and conceptual framework Informe

23、d by OAIS reference model Difference of opinion as to meaning of OAIS compliance,Oct. 26, 2004,DLF-PREMIS,22,Survey findings (cont.),Metadata Many recording rights, provenance, technical, administrative, descriptive and structural Consistent roles in preservation scope and policies (academic librari

24、es, archives, national libraries) Substantial use of METS, Z39.87/MIX, OCLC sets Most repositories serve goals of both preservation and access,Oct. 26, 2004,DLF-PREMIS,23,Trends,Store metadata redundantly in XML or relational database and with content data objects Use METS for structural metadata an

25、d as container for descriptive and administrative; MIX for images Use OAIS as framework and starting point Maintain multiple versions (originals, some normalized or migrated) in repository with complete metadata for all versions Choose multiple strategies for digital preservation,Oct. 26, 2004,DLF-P

26、REMIS,24,Looking ahead,Finalize core preservation metadata elements setComplete data dictionaryXML schemas to support exchange of core elements for digital provenance/process and technical metadataFinal PREMIS report by end of 2004Community outreach: opportunities for public commentFollow-on activit

27、ies?,Oct. 26, 2004,DLF-PREMIS,25,More information,PREMIS Web site: http:/www.oclc.org/research/projects/pmwg/“Implementing Metadata in Digital Preservation Systems: The PREMIS Activity” D-Lib (April 04) http:/www.dlib.org/dlib/april04/lavoie/04lavoie.htmlRebecca Guenther: rgueloc.govPriscilla Caplan: pcaplanufl.edu,