OCLC Online Computer Library Center Preservation Metadata Standards PREMIS & METS Taylor Surface, OCLC

OCLC Online Computer Library Center

Metadata and preservation metadata “Structured information that describes, explains, locates, or otherwise makes it easier to retrieve, use, or manage an information resource” METADATA Descriptive Structural Administrative PRESERVATION METADATA “Metadata that supports and documents the digital preservation process” Administrative Structural Descriptive

OCLC Online Computer Library Center Preservation Metadata: Examples  Provenance:  Who has had custody/ownership of the digital object?  Authenticity:  Is the digital object what it purports to be?  Preservation Activity:  What has been done to preserve the digital object?  Technical Environment:  What is needed to render and use the digital object?  Rights Management:  What IPR must be observed?

OCLC Online Computer Library Center Why is preservation metadata important?  Digital objects are …  technology-dependent …  mutable …  bound by intellectual property rights … Preservation metadata makes digital objects self-documenting across time

OCLC Online Computer Library Center Introduction to PREMIS PREservation Metadata Implementation Strategies

OCLC Online Computer Library Center PREMIS History  March 2000: OCLC, RLG jointly sponsored international working group on preservation metadata  Preservation metadata framework (June 2002)  Comprehensive, high-level description of types of information constituting preservation metadata  Used OAIS information model as starting point  Set of “prototype” preservation metadata elements  June 2003: OCLC, RLG sponsored international working group:  PREMIS: Preservation Metadata: Implementation Strategies  May 2005: Released Data Dictionary for Preservation Metadata: Final Report of the PREMIS Working Group:  Comprehensive, practical resource for implementing preservation metadata in digital archiving systems

OCLC Online Computer Library Center PREMIS Data Dictionary  May 2005: Data Dictionary for Preservation Metadata: Final Report of the PREMIS Working Group  237-page report includes:  PREMIS Data Dictionary 1.0  Accompanying report (context, data model, assumptions)  Special topics, glossary, usage examples  Data Dictionary: resource for implementing preservation metadata in digital archiving systems  Set of XML schema developed to support use of Data Dictionary

OCLC Online Computer Library Center From theory to practice … OAIS Digital Archiving Systems Framework PREMIS Data Dictionary PREMIS Data Dictionary Preservation Metadata Requirements

OCLC Online Computer Library Center PREMIS data model Intellectual Entities Objects Rights Agents Events

OCLC Online Computer Library Center Sample Data Dictionary entry

OCLC Online Computer Library Center Introduction to METS Metadata Encoding & Transmission Standard

OCLC Online Computer Library Center Digital Libraries – the need  Digitization technology well understood  Standards for many digitization processes are widely recognized However, no MARC standard exists for the digital library

OCLC Online Computer Library Center Lack of a standard – what it means  Poor cross-searching  Limited interchange facilities  Metadata tied to proprietary packages  Consequent obsolescence and conversion costs

OCLC Online Computer Library Center The solution …  Semantic consistency analogous to AACR2  Common container analogous to MARC METS is the container!

OCLC Online Computer Library Center METS to the rescue!  Developed through DLF collaboration  Maintained by Library of Congress  XML-based  Framework for holding all pieces of a digital object including various metadata  Does not prescribe metadata but endorses a number of schemes

OCLC Online Computer Library Center Overview of a METS package  Typically, one METS file corresponds to one “digital object”  Digital Object contents are either referenced or embedded  Metadata (descriptive, administrative, structural) is either referenced or embedded

OCLC Online Computer Library Center METS skeleton Mets Header fileSec dmdSec admSec behaviorSec structMap File inventory Descriptive metadata Administrative metadata Behavior metadata Structural metadata

OCLC Online Computer Library Center METS profiles  Profile describes an application of METS  Registered with LoC maintenance agency  Essential for interoperability of packages

OCLC Online Computer Library Center More PREMIS … More METS …

OCLC Online Computer Library Center Preservation Metadata Standards Me: