OAI Protocol for Metadata Harvesting Tim Brody Intelligence, Agents, Multimedia Group University of Southampton OpCit – http://opcit.eprints.org/ www.ecs.soton.ac.uk BCS Metadata Meeting, London 29 th May 2002 (Many slides borrowed from Michael L. Nelson)
OAI Protocol for Metadata Harvesting. Tim Brody Intelligence, Agents, Multimedia Group University of Southampton OpCit – http://opcit.eprints.org/ www.ecs.soton.ac.uk. BCS Metadata Meeting, London 29 th May 2002. (Many slides borrowed from Michael L. Nelson). OAI 2.0. - PowerPoint PPT Presentation
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OAI Protocol for Metadata Harvesting
Tim BrodyIntelligence, Agents, Multimedia Group
University of SouthamptonOpCit – http://opcit.eprints.org/
www.ecs.soton.ac.uk
BCS Metadata Meeting, London 29th May 2002(Many slides borrowed from Michael L. Nelson)
• Public, stable not released yet … (but very close)– Beta released mid-May– Public release scheduled: 1st June
• 2.0 implementations in the pipeline– British Library, Cornell Univ, Ex Libris, my.OAI, Humbolt
Univ, InQuirion Pty Ltd, Library of Congress, NASA, OCLC, Old Dominion Univ, U. of Illinois, U. of Southampton, UCLA, John Hopkins U., Indiana U., NYU, UKOLN, Virginia Tech
Open Archives Initiative
The protocol is openlydocumented, and metadatais “exposed” to at least somepeer group (note: rights management can still apply!)
Archive defined as a“collection of stuff” --not the archivist’s definition of “archive”. “Repository” used in most OAI documents.
OAI is happeningat break-neck speed...
Metadata Harvesting• Move away from distributed searching• Extract metadata from various sources• Build services on local copies of metadata
– Resources remain at remote repositories
user
. . .
search for “cfd applications”
local copy ofmetadata
metadataharvested offline
metadataharvested offline
metadataharvested offline
metadataharvested offline
each node independently maintained
all searching, browsing, etc. performed on the metadata hereindividual nodes can
<?xml version="1.0" encoding="UTF-8"?><OAI-PMH><responseDate>2002-0208T08:55:46Z</responseDate> <request>http://arXiv.org/oai2</request><error code=“badVerb”>ShowMe is not a valid OAI-PMH verb</error></OAI-PMH>
response with error
• Idempotency of resumptionToken: return same incomplete list when rT is re-issued• while no changes occur in the repo: strict• while changes occur in the repo: all items with unchanged
datestamp• new attributes for the resumptionToken:
• expirationDate• completeListSize• cursor
resumptionToken Flow-Control
• evolution• from talking about OAI-PMH
• to talking about projects that use OAI-PMH
• to talking about projects and failing to mention they use OAI-PMH