oclc online computer library center preservation metadata standards premis & mets taylor...
TRANSCRIPT
OCLC Online Computer Library Center
Preservation Metadata Standards
PREMIS & METS
Taylor Surface, OCLC
OCLC Online Computer Library Center
OCLC Online Computer Library Center
Metadata and preservation metadata
“Structured information thatdescribes, explains, locates,or otherwise makes it easier toretrieve, use, or manage aninformation resource”
METADATA
Descriptive
Structural
Administrative
PRESERVATIONMETADATA
“Metadata that supportsand documents the digitalpreservation 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
PREservationMetadata 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 …
OAISOAIS DigitalArchivingSystems
FrameworkFrameworkPREMIS
DataDictionary
PREMISData
Dictionary
Preservation Metadata Requirements
OCLC Online Computer Library Center
PREMIS data model
IntellectualEntities
Objects
Rights
Agents
Events
OCLC Online Computer Library Center
Sample Data Dictionary entrySemantic unit size Semantic components
None
Definition The size in bytes of the file or bitstream stored in the repository.
Rationale Size is useful for ensuring the correct number of bytes from storage have been retrieved and that an application has enough room to move or process files. It might also be used when billing for storage.
Data constraint Integer Object category Representation File Bitstream Applicability Not applicable Applicable Applicable Examples 2038927 Repeatability Not repeatable Not repeatable Obligation Optional Optional Creation/ Maintenance notes
Automatically obtained by the repository.
Usage notes Defining this semantic unit as size in bytes makes it unnecessary to record a unit of measurement. However, for the purpose of data exchange the unit of measurement should be stated or understood by both partners.
OCLC Online Computer Library Center
Introduction to METS
MetadataEncoding & 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 HeaderMets Header
fileSecfileSec
dmdSecdmdSec
admSecadmSec
behaviorSecbehaviorSec
structMapstructMap
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 …
http://www.loc.gov/standards/PREMIS
http://www.loc.gov/standards/METS
More METS …
