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Introduction to the OAI Protocol for Metadata Harvesting Version 2.0

Introduction to the OAI Protocol for Metadata Harvesting Version 2.0. Hussein Suleman Virginia Tech DLRL 25 March 2002. Version 2.0. Already ? Why ? What are you guys thinking ? But we didn’t implemented version 1.1 yet! OK, so what is it anyway ?. Already ?.

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Introduction to the OAI Protocol for Metadata Harvesting Version 2.0

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  1. Introduction to the OAI Protocol for Metadata HarvestingVersion 2.0 Hussein Suleman Virginia Tech DLRL 25 March 2002

  2. Version 2.0 • Already ? • Why ? What are you guys thinking ? • But we didn’t implemented version 1.1 yet! • OK, so what is it anyway ? OAI-PMH v2.0

  3. Already ? • Scheduled for release in mid-2002 • Detailed schedule • Alpha test - since 1 March 2002 • Beta test - 1 April 2002 • Expected release - 1 June 2002 • Anyone want to be an alpha or beta tester ? OAI-PMH v2.0

  4. Why ? • v1.0/v1.1 was experimental • v2.0 should be stable • Some minor shortcomings in semantics of v1.1 • Encoding issues that could be fixed OAI-PMH v2.0

  5. But we didn’t implement v1.1 yet • That’s OK! • v2.0 is not very different and in fact simpler for some things • Stay tuned... OAI-PMH v2.0

  6. Some New Features • Provenance containers • Granularity of harvesting • Orthogonality of setSpecs • More flow control • XML error codes • More consistent schemas OAI-PMH v2.0

  7. Provenance Containers • <about> is now a repeatable field • Special provenance container for historical information - esp. w.r.t hierarchical harvesting • <provenance> <originDescription> <baseURL>…</baseURL> <identifier>…</identifier> <metadataPrefix>…</metadataPrefix> <datestamp>…</datestamp> <harvestDate>…</harvestDate> </originDescription></provenance> OAI-PMH v2.0

  8. Granularity of Harvesting • Now supports times in addition to dates! • Finest granularity in Identify response • Full range: YYYY, YYYY-MM, YYYY-MM-DD, YYYY-MM-DDThh:mmZ, YYYY-MM-DDThh:mm:ssZ, YYYY-MM-DDThh:mm:ss.sZ • Must support coarser granularities • Error on finer granularities OAI-PMH v2.0

  9. Orthogonality of setSpecs • Previously you could not find the sets that an item belonged to • Now, every record header must include setSpecs • <record> <header> <identifier>…</identifier> <datestamp>…</datestamp> <setSpec>cs</setSpec> <setSpec>math</setSpec> </header> OAI-PMH v2.0

  10. More Flow Control • resumptionTokens now take additional optional parameters for better flow control • retryAfter ? resumeAfter ? • completeListSize • cursor • expirationDate OAI-PMH v2.0

  11. XML Error Codes • <error code=“badArgument”/> • Errors within the regular responses - no more HTTP 404s • Illegal verb results in an Identify response • Philosophy: separation of PMH and HTTP OAI-PMH v2.0

  12. More Consistent Schemas • Use standard schemas where available e.g., Dublin Core • Use single namespace for all requests/responses • No more arbitrary restrictions on format of metadataPrefix, setSpec, etc. OAI-PMH v2.0

  13. Now What ? • Anyone want to try it ? • Some features are still hotly debated • Any and all feedback will be appreciated • Future Work • Experiments • Extensions • SOAPification • Other protocols OAI-PMH v2.0

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