1. OAI-PMH The Open Archives Initiative Protocol for Metadata Harvesting Presenter: Knud Möller Friday, 30.07.2004

2. 30.07.2004 1 OAI-PMH - Knud Möller, DERI Galway Content Basic idea behind OAI-PMH Architectural Overview – Repositories and Harvesters – Resources, Items and Records Internal Record Format Sets Selective Harvesting Response Format Command Overview

3. 30.07.2004 2 OAI-PMH - Knud Möller, DERI Galway Basic idea behind OAI-PMH provide a standard protocol for the harvesting/ querying of metadata about any kind of resource - “What kind of resources can you provide and what are their properties?“ OAI-PMH is only the protocol, needs to be implemented some implementations exist: – Emblem Project Utrecht http://emblems.let.uu.nl/emblems/html/techoai.html – Virginia Tech (VTOAI) http://www.dlib.vt.edu/projects/OAI/software/vtoai/vtoai.html

4. 30.07.2004 3 OAI-PMH - Knud Möller, DERI Galway Architectural Overview Repositories and Harvesters Repository Harvester

5. 30.07.2004 4 OAI-PMH - Knud Möller, DERI Galway Architectural Overview Repositories and Harvesters Repository Harvester Request Harvesters issue OAI-PMH requests for metadata via HTTP.

6. 30.07.2004 5 OAI-PMH - Knud Möller, DERI Galway Architectural Overview Repositories and Harvesters Repository Harvester Request Response Harvesters issue OAI-PMH requests for metadata via HTTP. A Repository processes the OAI-PMH requests and has to implement the protocol.

7. 30.07.2004 6 OAI-PMH - Knud Möller, DERI Galway Architectural Overview Resources, Items and Records Resource Anything - physical artifact, a digital resource, a concept, etc. Whatever the metadata is about.

8. 30.07.2004 7 OAI-PMH - Knud Möller, DERI Galway Architectural Overview Resources, Items and Records Resource Item Representation of resource in repository. Can disseminate metadata in various formats. Must always provide Dublin Core. Has unique identifier. Anything - physical artifact, a digital resource, a concept, etc. Whatever the metadata is about. oai:arXiv.org:cs/0112017

9. 30.07.2004 8 OAI-PMH - Knud Möller, DERI Galway Architectural Overview Resources, Items and Records Resource Item Record (oai_dc) Record (lom) Record (id3) XML-encoded byte stream of actual metadata. Anything - physical artifact, a digital resource, a concept, etc. Whatever the metadata is about. Representation of resource in repository. Can disseminate metadata in various formats. Must always provide Dublin Core. Has unique identifier. oai:arXiv.org:cs/0112017

10. 30.07.2004 9 OAI-PMH - Knud Möller, DERI Galway Internal Record Format I

11. 30.07.2004 10 OAI-PMH - Knud Möller, DERI Galway Internal Record Format I oai:arXiv.org:cs/0112017 2002-02-28 cs math

12. 30.07.2004 11 OAI-PMH - Knud Möller, DERI Galway Internal Record Format II <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance“ xsi:schemaLocation= "http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd"> Using Structural Metadata to Localize Experience of Digital Content Dushay, Naomi Digital Libraries With the increasing [..bla..] to particular communities of users. 2001-12-14 e-print http://arXiv.org/abs/cs/0112017

13. 30.07.2004 12 OAI-PMH - Knud Möller, DERI Galway Internal Record Format III <provenance xmlns="http://www.openarchives.org/OAI/2.0/provenance" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation= "http://www.openarchives.org/OAI/2.0/provenance http://www.openarchives.org/OAI/2.0/provenance.xsd"> <originDescription harvestDate="2002-02-02T14:10:02Z" altered="true"> http://the.oa.org oai:r2.org:klik001 2002-01-01 http://www.openarchives.org/OAI/2.0/oai_dc/

14. 30.07.2004 13 OAI-PMH - Knud Möller, DERI Galway Sets Items can be organized into sets. Sets can either be organized flat or hierarchically. setNamesetSpec Institutions institution Oceanside University of Nebraska institution:nebraska Valley View University of Florida institution:florida Subject subject Existential Kenesiology subject:kenesiology Quantum Psychology subject:quantum

15. 30.07.2004 14 OAI-PMH - Knud Möller, DERI Galway Selective Harvesting Harvesters can specify some constraints on which items they are interested in Regarding datestamps: – only items that where created, modified or deleted (optional) in a certain time period Regarding sets: – only items that belong to a specific set (or any of its subsets)

16. 30.07.2004 15 OAI-PMH - Knud Möller, DERI Galway Response Format <OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/“ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance“ xsi:schemaLocation= "http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd"> 2002-05-01T19:20:30Z <request verb="GetRecord" identifier="oai:arXiv.org:hep-th/9901001“ metadataPrefix="oai_dc"> http://an.oa.org/OAI-script...

17. 30.07.2004 16 OAI-PMH - Knud Möller, DERI Galway Command Overview I GetRecord: get a specific record, must specify item‘s URI and metadata prefix Identify: retrieve information about a repository (name, protocol version, supports deletion,...) ListRecords: get either all records or a subset, must specify metadata prefix ListIdentifiers: like ListRecords, but retrieves only headers

18. 30.07.2004 17 OAI-PMH - Knud Möller, DERI Galway Command Overview II ListMetadataFormats: lists the available metadata formats of a repository ListSets: returns the set structure of a repository

19. 30.07.2004 18 OAI-PMH - Knud Möller, DERI Galway References OAI-PMH specification: http://www.openarchives.org/OAI/2.0/openar chivesprotocol.htm http://www.openarchives.org/OAI/2.0/openar chivesprotocol.htm

20. 30.07.2004 19 OAI-PMH - Knud Möller, DERI Galway Thanks and goodbye!