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Digital Libraries:

Digital Libraries:. Harvesting: OpenArchivesInitiative (OAI). I. OAI. aims and concepts. history. organisation. II. Harvesting. definitions. data provider and service provider. OAI-PMH. OAI: Aims and concepts.

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Digital Libraries:

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  1. Digital Libraries: Harvesting: OpenArchivesInitiative (OAI)

  2. I. OAI • aims and concepts • history • organisation II. Harvesting • definitions • data provider and service provider • OAI-PMH

  3. OAI: Aims and concepts • increasing the availability of scholarly communication by increasing easier access to digital material • easier access is provided by developing technological frameworks and standards (for example OAI-PMH) • access should be independent of the type of content offered and the economic mechanisems surrounding the content. • OIA is committed to exploring and enabling a new and broader range of application

  4. world-wide consolidation of scholarly archives • free access to the archives (at least: metadata) • consistent interfaces for archives and service provider • low barrier protocol / effortless implementation (e.g., • because based on HTTP, XML, DC)

  5. History • independent development of different solutions • Santa Fe Meeting 1999 • OAI-PMH= mechanism for harvesting metadata records from one system to another system from a Data Provider to a Service Provider; it‘s not a search protocol, but a base layer on which to build other services

  6. Organisation OAI is supported by Digital Library Federation, the Coalition for Network Information and from the National Science Foundation • Steering Committee • Executive Committee • Set of Technical Committees

  7. Harvesting: definition Harvesting is the gathering of metadata from a number of distributed repositories into a combined data store Data Provider: deposit and publishing of resources in a repository and expose for harvesting the metadata of resources Service Provider: harvest metadata from Data Provider use metadata for purpose of providing one or more services across all data

  8. Multiple service provider can harvest for multiple Data Providers

  9. Aggregator is a Data Provider and a Service Provider

  10. Harvesting and Searching

  11. Harvesting is defined by the OAI-Protocol for Metadata Harvesting (OAI-PMH) • OAI-PMH is based on • HTTP • 6 request types =verbs • responses are encoded • in XML

  12. Flow control

  13. Request Types: • Identify • ListMetadataFormats • ListSets • ListIdentifiers • ListRecords • GetRecords example     archive.org/oai-script?verb=Identify

  14. Response to ListIdentifiers request

  15. Response to GetRecord request

  16. Example: Data Provider

  17. Resumption token

  18. http://www.openarchives.org/ • http://www.oaforum.org/tutorial/

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