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Perspectives on Metadata Harvesting at the University of Illinois

This article discusses the Open Archives Initiative (OAI) provider and harvesting services implemented at the University of Illinois. It covers the metadata schemas and formats used, the implementation process, service issues, and plans for harvesting service. The article also addresses research issues related to harvesting services and explores options for exploiting non-DC metadata.

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Perspectives on Metadata Harvesting at the University of Illinois

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  1. The Open Archives Initiative: Perspectives on Metadata HarvestingOAI Provider & Harvesting Servicesat the University of Illinois Timothy W. ColeMathematics LibrarianChair, Library Information Technology Committee University of Illinois at Urbana-Champaignt-cole3@uiuc.edu 25 June 2001

  2. Illinois DL Projects Generating Metadata • Sci-Tech Article Testbed (CNRI D-Lib Test Suite) • Digital Imaging & Multimedia Technology • Teaching with Digital Content (IMLS) • Historical Map & Aerial Photo Digitization Projects • University Archives & Special Collections • Manuscript Archive Finding Aids • Emblem Book Digitization Project • Kolb-Proust Archive OAI Provider & Harvesting Servicesat the University of Illinois

  3. Metadata Schemas & Formats • Metadata Schemas Currently Used: • Dublin Core (DC), Qualified Dublin Core (DCQ) • Federal Geographic Data Committee (FGDC) • Encoded Archival Description (EAD) • Text Encoding Initiative (TEI) • Local custom schemas (e.g., Emblem Book Project) • Metadata Storage Formats: • HTML, XML, RDF-XML • Relational Databases (MS Access, SQL) • XPat (OpenText) Document Database OAI Provider & Harvesting Servicesat the University of Illinois

  4. To Implement OAI Provider Service • Map (Transform) Metadata • OAI Aimed at Sharing “Item-Level” Metadata • OAI Requires Mapping to LCD Schema (DC) • OAI Supports Other Schemas, But XSD Required • Create the Service (HTTP-Based) • Easy, Lightweight Protocol • Does Require XML & Scripting / CGI Programming • Designed for Bulk Interchange of Metadata OAI Provider & Harvesting Servicesat the University of Illinois

  5. Illinois OAI Provider Implementation • Service Architectures: • Windows NT, IIS 4, Access / SQL Server, VBScript • Strategy 1: Administrative & Descriptive Data in DB • Strategy 2: Administrative Data in DB Descriptive Metadata in XML Use XSLT When Constructing OAI Response • Sample “Turnkey” Implementations Available From www.openarchives.org Site OAI Provider & Harvesting Servicesat the University of Illinois

  6. Illustrations • Aerial Photos Database Schema • In DCQ-RDF • As OAI_DC Record • Journal Article Metadata in XML (DCQ / RDF) • As OAI_DC Record • EAD Finding Aid in XML • As DCQ-RDF • As OAI_DC Record • Collection-Level vs. Item-Level Metadata OAI Provider & Harvesting Servicesat the University of Illinois

  7. OAI Provider Service Issues & Tools • Implementation & Maintenance Issues: • Records Mgmt. (Sets, Deleted Records) • Synchronicity (Integration w/ Existing Services) • Flow Control (Mgmt. Of Service Load) • Resumption Token Issues • Access Control (Restrictions on Metadata) • Useful Tools: • OAI Repository Explorer • W3C’s XSV Validating Parser • OAI Registry OAI Provider & Harvesting Servicesat the University of Illinois

  8. Plans for Harvesting Service • Implement OAI Spider & Indexing Systems • Harvest Metadata -- 2 Collection Approaches • Michigan:Freely Available, Online Scholarly Full Content • Illinois:Cultural Heritage Materials, Whether Print or Digital, Whether Freely Available or Restricted Access • Investigate Post-Harvesting Issues OAI Provider & Harvesting Servicesat the University of Illinois

  9. Harvesting Service Research Issues • Interface Design & Value Added Services • Impact of Cross-Schema Mapping Practices • Options for Exploiting Non-DC Metadata • Impact of Variations in Completeness & Granularity of Metadata Harvested • Techniques to Ameliorate Those Impacts • Roles of Providers & Harvesters / Sustainability • 1-Day Workshop in Urbana Planned For Interested OAI Providers (September 2001) OAI Provider & Harvesting Servicesat the University of Illinois

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