The OAI ORE Project


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Update on work of OAI ORE presented to meeting of JISC CETIS Metadata & Digital Repositories SIG, held at Birkbeck, London, Tuesday 12 February 2008

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  • Eduserv Foundation established in July 2003 mission to support the effective application of information and communication technology in education largely achieved thru external grant making activities to date desire to develop in-house resource, developing standards, specifications, demonstrators – software and services
  • The OAI ORE Project

    1. 1. The OAI Object Reuse & Exchange Project JISC CETIS Metadata & Digital Repositories SIG meeting, London
    2. 2. The OAI Object Reuse & Exchange Project <ul><li>The ORE project </li></ul><ul><li>The ORE alpha specs </li></ul><ul><ul><li>Abstract Data Model </li></ul></ul><ul><li>Current/upcoming events & activities </li></ul>Title slide photo of mosaic from Palau de la Musica Catalana, Barcelona by Flickr user docman See Made available under Creative Commons Attribution-NonCommercial License
    3. 3. The ORE Project
    4. 4. The ORE Project <ul><li>Project under umbrella of Open Archives Initiative </li></ul><ul><ul><li>October 2006/September 2008 </li></ul></ul><ul><li>Supported by Andrew W. Mellon Foundation, with additional support from National Science Foundation & Microsoft </li></ul><ul><li>International participation </li></ul><ul><ul><li>Coordinators: Carl Lagoze (Cornell) & Herbert Van de Sompel (LANL Research Lib) </li></ul></ul><ul><ul><li>Advisory Committee (16): strategic guidance </li></ul></ul><ul><ul><li>Technical Committee (14): the work!  </li></ul></ul><ul><ul><ul><li>“ Editorial SubGroup” (6) </li></ul></ul></ul><ul><ul><li>Liaison Group (9): linkage with similar activities </li></ul></ul>
    5. 5. The ORE Project <ul><li>“ ORE will develop specifications that allow distributed repositories to exchange information about their constituent digital objects” </li></ul><ul><ul><li>“ Digital objects” as compound, composite (etc) </li></ul></ul><ul><ul><li>e.g. multi-page doc, image set, set of doc + data, reading list etc </li></ul></ul><ul><ul><li>Identified bounded aggregations of related information units that form a logical whole </li></ul></ul><ul><li>How does provider encode/disclose descriptions of aggregations? </li></ul><ul><li>How does consumer discover/interpret descriptions of aggregations? </li></ul><ul><li>Set of alpha specifications released Dec 2007 </li></ul>
    6. 6. The ORE alpha specs
    7. 7. ORE alpha Specifications <ul><li>Based on work of ORE Technical Committee </li></ul><ul><ul><li>Authored by “editorial subgroup” </li></ul></ul><ul><li>Public alpha release December 2007 </li></ul><ul><ul><li>Comments to oai-ore Google Group </li></ul></ul><ul><li>Six documents </li></ul><ul><ul><li>Abstract Data Model (and Overview) </li></ul></ul><ul><ul><li>Resource Map Profile of Atom (and Overview) </li></ul></ul><ul><ul><li>Vocabulary </li></ul></ul><ul><ul><li>Resource Map Discovery </li></ul></ul><ul><li>Generally, aim at lightweight, widely-applicable approach </li></ul><ul><ul><li>specify minimum necessary that is useful </li></ul></ul>
    8. 8. ORE Abstract Data Model <ul><li>Builds on principles of </li></ul><ul><ul><li>Architecture of World Wide Web </li></ul></ul><ul><ul><li>Resource Description Framework (RDF) </li></ul></ul><ul><ul><li>Named Graphs </li></ul></ul><ul><li>Web Arch </li></ul><ul><ul><li>Resource-oriented view of problem space </li></ul></ul><ul><ul><li>Use of URIs as globally-scoped resource identifiers </li></ul></ul><ul><ul><li>Uniform interface </li></ul></ul><ul><ul><li>Exchange of information about resource state (representations) </li></ul></ul><ul><ul><li>Hypermedia: representations provide more URIs </li></ul></ul><ul><li>RDF </li></ul><ul><ul><li>Description of typed relationships between resources using RDF triples </li></ul></ul><ul><ul><li>Graph as set of triples </li></ul></ul><ul><li>Named Graph </li></ul><ul><ul><li>RDF graph is resource which can be named (by URI) </li></ul></ul><ul><li>See also: Linked Data </li></ul>
    9. 9. Aggregation Aggregated Resource is-gathered-into m n Resource Map is-described-by 1 1 The “core” ORE model
    10. 10. ORE Resource Map <ul><li>Named RDF Graph </li></ul><ul><li>Must express </li></ul><ul><ul><li>Relationship between Resource Map and Aggregation </li></ul></ul><ul><ul><li>Relationships between Aggregation and Aggregated Resources </li></ul></ul><ul><ul><li>Basic metadata about Resource Map </li></ul></ul><ul><li>May express </li></ul><ul><ul><li>Additional metadata about Resource Map </li></ul></ul><ul><ul><li>Metadata about Aggregation, relationships w other resources </li></ul></ul><ul><ul><li>Metadata about Aggregated Resources, relationships w other resources </li></ul></ul><ul><li>Small RDF vocabulary defined by ORE </li></ul><ul><li>“ Aggregation Graph” as formally defined subgraph of Resource Map </li></ul>
    11. 11. AR-1 AR-2 A-1 ReM-1 ore:describes ore:aggregates ore:aggregates Agent-A “ yy-mm-dd” dc:creator dcterms:modified Minimal ORE Resource Map Aggregation Graph
    12. 12. Other ORE documents <ul><li>Resource Map Profile of Atom </li></ul><ul><ul><li>Profile of Atom Syndication Format </li></ul></ul><ul><ul><li>Supports subset of Resource Map features </li></ul></ul><ul><ul><li>GRDDL-able i.e. mapping to RDF/XML via XSLT </li></ul></ul><ul><ul><li>Currently only serialisation format specified by alpha specs </li></ul></ul><ul><ul><li>beta specs will (probably!) include guidelines for RDF syntaxes </li></ul></ul><ul><li>Resource Map Discovery </li></ul><ul><ul><li>Conventions for disclosure of Resource Maps </li></ul></ul><ul><ul><ul><li>OAI-PMH, sitemaps etc </li></ul></ul></ul><ul><ul><ul><li>Links from representations of Aggregated Resources to Resource Map etc </li></ul></ul></ul>
    13. 13. Current/upcoming events & activities
    14. 14. Current/upcoming events/activities <ul><li>ORE TC currently preparing next versions of specs </li></ul><ul><li>USA Open meeting </li></ul><ul><ul><li>3 March, John Hopkins University, Baltimore, MD </li></ul></ul><ul><li>European Open meeting </li></ul><ul><ul><li>4 April, Univ of Southampton (post-OR2008) </li></ul></ul><ul><li>Implementation/experimentation projects </li></ul><ul><ul><li>Mellon Foundation </li></ul></ul><ul><ul><ul><li>Michael Nelson, Old Dominion University </li></ul></ul></ul><ul><ul><ul><li>Tim Cole, Univ of Illinois at Urbana-Champaign </li></ul></ul></ul><ul><ul><li>JISC </li></ul></ul><ul><ul><ul><li>tbc! </li></ul></ul></ul><ul><ul><li>Others e.g. ORE Chem </li></ul></ul><ul><li>ORE TC response to comments </li></ul><ul><li>Version 1 specs by September 2008 </li></ul>
    15. 15. ORE in short <ul><li>A Webby approach to “compound objects”, simple part-whole relationships… </li></ul><ul><li>… built on a resource-oriented perspective </li></ul><ul><li>Simple but extensible </li></ul><ul><li>Relationship with e.g. IMS CP, METS, DIDL? </li></ul><ul><li>Seed of a more resource-oriented approach to “repository”? </li></ul>
    16. 16. The OAI Object Reuse & Exchange Project JISC CETIS Metadata & Digital Repositories SIG meeting, London