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GUIDs in EMu

GUIDs in EMu. Ian Turnbull KE Software. GUID? UUID?. A Globally Unique Identifier (GUID) is a persistent unique reference number used as an identifier. A Universally Unique Identifier (UUID) is a particular implementation of GUID.

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GUIDs in EMu

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  1. GUIDs in EMu Ian Turnbull KE Software

  2. GUID? UUID? • A Globally Unique Identifier (GUID) is a persistent unique reference number used as an identifier. • A Universally Unique Identifier (UUID) is a particular implementation of GUID. • Some other GUID implementations are LSID, EZID, DOI, Darwin Core Triples. • Opaque GUIDs? • Resolvability?

  3. Background • For US institutions the National Science Foundation (NSF) digitisation grants require recipients to provide a copy of their biodiversity data to the NSF iDigBiorepository with a GUID identifier. • Draft proposal prepared by Larry Gall of YPMNH with contributions from a number of other EMu customers. • KE proposal released for review and comment via EMu Users forum in September 2013.

  4. Four Phases Proposed • Phase 1Storing GUIDs in EMu • Phase 2GUID generation on EMu record save • Phase 3Local IMu web service for local resolution of EMuGUIDs • Phase 4Global IMu web service portal for global resolution of EMuGUIDs

  5. Phase 1 - Storing GUIDs in EMu • Available in most EMumodules • Catalogue, Collection Events, Multimedia, Parties, and Taxonomy likely candidates for GUIDs • GUID fields on Admin tab • Multiple GUID values can be stored per record

  6. Phase 1 - Storing GUIDs in EMu

  7. Phase 1 - Storing GUIDs in EMu

  8. Phase 2 – GUID Generation • On record save GUID(s) can be generated • Configurable per module (off by default) • UUID Version 4 identifier generated • Extensible for support of other GUID schemes

  9. Phase 2 – UUID Version 4 http://en.wikipedia.org/wiki/Uuidhttp://en.wikipedia.org/wiki/Uniform_resource_name • A randomly generated GUID with infinitesimal probability of a duplicate 84b567d5-dbbd-468a-be12-770747ebc397 • Can be quickly generated locally without referring to a central naming authority; or pre-generating identifiers • Can be represented as a URNurn:uuid:84b567d5-dbbd-468a-be12-770747ebc397 • Opaque

  10. Phase 3 – Local Resolution of EMu GUIDs • Without a resolving service a GUID is simply an identifier without means of obtaining metadata • A GUID is “actionable” with a resolving service • Local IMu web service (no presentation logic) • Receives web requests and returns match status and associated metadata

  11. Phase 4 – Global Resolution of EMu GUIDs • EMu community GUID resolution service • Receives web requests; polls registered providers for GUID match; returns metadata • Initial intention is for global resolver to be lightweight. It will not aggregate from institutions, each institution simply runs the Local web service. • KE can initially host but expectation is that an EMu customer will become the host

  12. Time frame? • Phase 1 - Storing GUIDsLate 2013 • Phase 2 - GUID generationEarly 2014 • Phase 3 - Local IMu web serviceMid 2014 • Phase 4 - Global IMu web serviceLate 2014

  13. Questions?

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