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Metadata Repositories for InteroperableShareable Metadata
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Title: 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)
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