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Timothy W. Cole ( t-cole3@uiuc ) Thomas G. Habing ( thabing@uiuc )

Experiences Implementing OAI Provider Services 13 September 2001 -- ACM SIGIR, New Orleans Open Archives: Communities, Interoperability and Services. Timothy W. Cole ( t-cole3@uiuc.edu ) Thomas G. Habing ( thabing@uiuc.edu ) University of Illinois at Urbana-Champaign.

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Timothy W. Cole ( t-cole3@uiuc ) Thomas G. Habing ( thabing@uiuc )

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  1. Experiences Implementing OAI Provider Services13 September 2001 -- ACM SIGIR, New OrleansOpen Archives: Communities, Interoperability and Services Timothy W. Cole(t-cole3@uiuc.edu) Thomas G. Habing(thabing@uiuc.edu) University of Illinois at Urbana-Champaign

  2. Our Observations & Generalizations • Creation & Management of Metadata Much More Difficult than Implementation of OAI PMH • Wide Range of Viable Implementation Options, But Some Workflow Accommodation Is Required • Scalability & Value of Services That Can Be Built On Top of OAI PMH Remain To Be Proven • Greatest Strength May Be Content & Format Flexibility for Metadata / Data shared via OAI Timothy W. Cole – University of Illinois at UCOpen Archives: Communities, Interoperability and Services

  3. Our Architecture Approach Timothy W. Cole – University of Illinois at UCOpen Archives: Communities, Interoperability and Services

  4. Our Technical Choices • Use of Sets: Hierarchical, Non-Overlapping, Comprehensive Set Name Reflected in Identifier (colon delimited) • Repository Updates: Scheduled Time of Day for Routine Updates Repository Taken Offline During Update (Respond 503) • Flow Control: Use with ListRecords & ListIdentifiers Only ResumptionTokens Expire with Repository Update Timothy W. Cole – University of Illinois at UCOpen Archives: Communities, Interoperability and Services

  5. Additional Metadata Formats • Other Metadata Formats of Interest: • Qualified DC in RDF (More Structured) • MARC (Have Existing Data) • EAD (Have Existing Data) • Crosswalks to DC • Better Done by Provider or Harvester? • Complex Crosswalks (e.g., from EAD) a Concern • Use of Multiple Namespaces with XSD • Canonical Namespaces, But No Canonical XSDs • XSD Import, ##any / ##other, lax Processing Timothy W. Cole – University of Illinois at UCOpen Archives: Communities, Interoperability and Services

  6. Our List of Open Issues & Concerns • IP Rights Management • Need Machine-Readable “<about>” Formats • Restricted Access Harvesting & Use Limitations • Use of Sets • Consensus on Best Practices • Concept of Null Set or Set Information as Part of Record Header Element • OAI Record Timestamp Granularity Timothy W. Cole – University of Illinois at UCOpen Archives: Communities, Interoperability and Services

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