Experiences Implementing OAI Provider Services 13 September 2001 -- ACM SIGIR, New Orleans Open Archives: Communities, Interoperability and Services Timothy.

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Presentation transcript:

Experiences Implementing OAI Provider Services 13 September ACM SIGIR, New Orleans Open Archives: Communities, Interoperability and Services Timothy W. Cole Thomas G. Habing University of Illinois at Urbana-Champaign

13 September 2001 Timothy W. Cole – University of Illinois at UC Open Archives: Communities, Interoperability and Services 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

13 September 2001 Timothy W. Cole – University of Illinois at UC Open Archives: Communities, Interoperability and Services 3 Our Architecture Approach

13 September 2001 Timothy W. Cole – University of Illinois at UC Open 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

13 September 2001 Timothy W. Cole – University of Illinois at UC Open 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

13 September 2001 Timothy W. Cole – University of Illinois at UC Open Archives: Communities, Interoperability and Services 6 Our List of Open Issues & Concerns IP Rights Management –Need Machine-Readable “ ” 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