Metadata Repositories for InteroperableShareable Metadata

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Metadata Repositories for Interoperable/Shareable
Metadata
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Various levels of metadata projects
Application Profile
Repository
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Benefits of creating shareable metadata

• It will be interoperable, or meaningful when
  combined with metadata from other sources.
• Your resources are more likely to be found when
  pooled together with resources from other
  providers, rather than not being retrieved by
  searchers due to inconsistencies or gaps in
  description.
• It will increase the number of access points for
  your resources available to end-users.

Source OAI Best Practices. http//oai-best.comm.n
sdl.org/cgi-bin/wiki.pl?PublicTOC
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1. OAI

• Open Archives Initiative Protocol for Metadata
  Harvesting (OAI-PMH)
• http//www.openarchives.org/

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• Protocol
• A protocol is a set of rules defining
  communication between systems.
• E,g., HTTP, FTP
• HarvestingIn the OAI context, harvesting refers
  specifically to the gathering together of
  metadata from a number of distributed
  repositories into a combined data store.

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OAI-Protocol for Metadata Harvesting (OAI-PMH)

• It defines a mechanism for harvesting records
  containing metadata from repositories.
• It gives a simple technical option for data
  providers to make their metadata available to
  services, based on the open standards HTTP and
  XML.
• The metadata that is harvested
• may be in any format that is agreed by a
  community (or by any discrete set of data and
  service providers), although unqualified Dublin
  Core is specified to provide a basic level of
  interoperability.

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• Two classes of participants
• Data Providers administer systems that support
  the OAI-PMH as a means of exposing metadata and
• Service Providers use metadata harvested via the
  OAI-PMH as a basis for building value-added
  services.
• The protocol mandate a common metadata format
  unqualified Dublin Core.
• http//www.openarchives.org/OAI/2.0/openarchivespr
  otocol.htm

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Before harvesting
each has a different metadata structure
e-print
FTXT
OPAC
AI
image
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metadata
Metadata from many sources can be gathered
together in one database, and services can be
provided based on this centrally harvested, or
"aggregated" data.
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An example NSDL Metadata Repository

• NSDL National Science Digital Library
• The comprehensive source for science, technology,
  engineering and mathematics education.
• Funded by the National Science Foundation.
• 192 funded projects (2000-2004)
• http//www.nsdl.org

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200 projects .collections .services.targeted
research.pathways.core integration
All NSDL Collections and Services
Source NSDL Core Integration, Technical
Overview, 2001
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Source NSDL Core Integration, Technical
Overview, 2001
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ADLstandard report
ADLXML report
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NSDL enables cross-collection searching
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Provides detailed metadata records
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Benefits of the OAI approach

• 1. Material can be accessed more widely
• 2. Material can be exploited for purposes
  different from those that originally motivated
  the creation of the repositories
• 3. New and improved services can be constructed
  because of the possibility of accessing multiple
  repositories and
• 4. There is potential for cost-saving inherent in
  new models of the scholarly communication process
  that could be realized through an open archives
  approach.

Summarized by Carpenter (2003)