The OAI ORE Project

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Feb

ruary

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Pete Johnston, Eduserv [email protected]

www.eduserv.org.uk/foundation

The OAI Object Reuse & Exchange Project

JISC CETIS Metadata & Digital Repositories SIG meeting, London

12 February 2008JISC CETIS Metadata & Digital Repositories SIG meeting, London 2

The OAI Object Reuse & Exchange Project

• The ORE project

• The ORE alpha specs– Abstract Data Model

• Current/upcoming events & activities

Title slide photo of mosaic from Palau de la Musica Catalana, Barcelona by Flickr user docmanSee http://www.flickr.com/photos/docman/364629766/ Made available under Creative Commons Attribution-NonCommercial License

http://www.openarchives.org/ore/

12 February 2008JISC CETIS Metadata & Digital Repositories SIG meeting, London 3

The ORE Project

12 February 2008JISC CETIS Metadata & Digital Repositories SIG meeting, London 4

The ORE Project

• Project under umbrella of Open Archives Initiative– October 2006/September 2008

• Supported by Andrew W. Mellon Foundation, with additional support from National Science Foundation & Microsoft

• International participation– Coordinators: Carl Lagoze (Cornell) & Herbert Van de

Sompel (LANL Research Lib)– Advisory Committee (16): strategic guidance– Technical Committee (14): the work!

• “Editorial SubGroup” (6)

– Liaison Group (9): linkage with similar activities

12 February 2008JISC CETIS Metadata & Digital Repositories SIG meeting, London 5

The ORE Project

• “ORE will develop specifications that allow distributed repositories to exchange information about their constituent digital objects”

– “Digital objects” as compound, composite (etc)– e.g. multi-page doc, image set, set of doc + data,

reading list etc – Identified bounded aggregations of related

information units that form a logical whole

• How does provider encode/disclose descriptions of aggregations?

• How does consumer discover/interpret descriptions of aggregations?

• Set of alpha specifications released Dec 2007

12 February 2008JISC CETIS Metadata & Digital Repositories SIG meeting, London 6

The ORE alpha specs

12 February 2008JISC CETIS Metadata & Digital Repositories SIG meeting, London 7

ORE alpha Specifications

• Based on work of ORE Technical Committee– Authored by “editorial subgroup”

• Public alpha release December 2007– Comments to oai-ore Google Group

• Six documents– Abstract Data Model (and Overview)– Resource Map Profile of Atom (and Overview)– Vocabulary– Resource Map Discovery

• Generally, aim at lightweight, widely-applicable approach

– specify minimum necessary that is useful

12 February 2008JISC CETIS Metadata & Digital Repositories SIG meeting, London 8

ORE Abstract Data Model

• Builds on principles of– Architecture of World Wide Web – Resource Description Framework (RDF)– Named Graphs

• Web Arch– Resource-oriented view of problem space– Use of URIs as globally-scoped resource identifiers– Uniform interface– Exchange of information about resource state (representations)– Hypermedia: representations provide more URIs

• RDF– Description of typed relationships between resources using RDF

triples– Graph as set of triples

• Named Graph– RDF graph is resource which can be named (by URI)

• See also: Linked Data

Aggregation

AggregatedResource

is-gathered-into

m

n

ResourceMapis-described-by

1 1

The “core” ORE model

12 February 2008JISC CETIS Metadata & Digital Repositories SIG meeting, London 10

ORE Resource Map

• Named RDF Graph• Must express

– Relationship between Resource Map and Aggregation– Relationships between Aggregation and Aggregated Resources– Basic metadata about Resource Map

• May express– Additional metadata about Resource Map– Metadata about Aggregation, relationships w other resources– Metadata about Aggregated Resources, relationships w other

resources

• Small RDF vocabulary defined by ORE• “Aggregation Graph” as formally defined subgraph of

Resource Map

AR-1 AR-2

A-1

ReM-1

ore:describes

ore:aggregatesore:aggregates

Agent-A

“yy-mm-dd”

dc:creator

dcterms:modified

Minimal ORE Resource MapAggregation Graph

12 February 2008JISC CETIS Metadata & Digital Repositories SIG meeting, London 12

Other ORE documents

• Resource Map Profile of Atom– Profile of Atom Syndication Format

– Supports subset of Resource Map features

– GRDDL-able i.e. mapping to RDF/XML via XSLT

– Currently only serialisation format specified by alpha specs

– beta specs will (probably!) include guidelines for RDF syntaxes

• Resource Map Discovery– Conventions for disclosure of Resource Maps

• OAI-PMH, sitemaps etc

• Links from representations of Aggregated Resources to Resource Map etc

12 February 2008JISC CETIS Metadata & Digital Repositories SIG meeting, London 13

Current/upcoming events & activities

12 February 2008JISC CETIS Metadata & Digital Repositories SIG meeting, London 14

Current/upcoming events/activities

• ORE TC currently preparing next versions of specs• USA Open meeting

– 3 March, John Hopkins University, Baltimore, MD• European Open meeting

– 4 April, Univ of Southampton (post-OR2008)• Implementation/experimentation projects

– Mellon Foundation• Michael Nelson, Old Dominion University• Tim Cole, Univ of Illinois at Urbana-Champaign

– JISC• tbc!

– Others e.g. ORE Chem• ORE TC response to comments• Version 1 specs by September 2008

12 February 2008JISC CETIS Metadata & Digital Repositories SIG meeting, London 15

ORE in short

• A Webby approach to “compound objects”, simple part-whole relationships…

• …built on a resource-oriented perspective

• Simple but extensible

• Relationship with e.g. IMS CP, METS, DIDL?

• Seed of a more resource-oriented approach to “repository”?http://www.openarchives.org/ore/

12

Feb

ruary

20

08

Pete Johnston, Eduserv [email protected]

www.eduserv.org.uk/foundation

The OAI Object Reuse & Exchange Project

JISC CETIS Metadata & Digital Repositories SIG meeting, London