1. NSDL & the Open Archives Initiative A Brief Introduction to OAI Timothy W. Cole (t-cole3@uiuc.edu) Mathematics Librarian & Professor of Library Administration University of Illinois at Urbana-Champaignt-cole3@uiuc.edu NSDL All Projects Meeting Washington, D.C. 14 October 2003 http://dli.grainger.uiuc.edu/Publications/TWCole/NSDL2003/ColeOAIIntro.ppt

2. 2 The Open Archives Initiative & NSDL 14 October 2003 t-cole3@uiuc.edu University of Illinois at UC Session outline Presenters Naomi Dushay, Cornell University (naomi@cs.cornell.edu) Stephen P Sarapata, ENC / The Ohio State University (ssarapat@enc.org) John Weatherley, Univ. Corp. for Atmospheric Research (jweather@ucar.edu) General Discussion General questions & comments Sharing experiences with OAI

3. 3 The Open Archives Initiative & NSDL 14 October 2003 t-cole3@uiuc.edu University of Illinois at UC The Open Archives Initiative Harvesting approach to interoperability at metadata level Divides world into Metadata Providers & Service Providers Builds on HTTP, XML, & Dublin Core http://www.openarchives.org/

4. 4 The Open Archives Initiative & NSDL 14 October 2003 t-cole3@uiuc.edu University of Illinois at UC OAI – PMH: How it works OAI “VERBS” Identify ListMetadataFormats ListSets ListIdentifiers ListRecords GetRecord HARVESTERHARVESTER REPOSITORYREPOSITORY OAI Service Provider Metadata Provider HTTP Request HTTP Response (OAI Verb) (Valid XML) OAI

5. 5 The Open Archives Initiative & NSDL 14 October 2003 t-cole3@uiuc.edu University of Illinois at UC A few protocol details OAI Transaction: An OAI request (HTTP Post/Get) & the corresponding OAI response (XML via HTTP) Optional: use resumptionToken & other flow control mechanisms to manage service load An OAI item is the metadata about a resource; An OAI record is an item expressed in a particular format Item Identifiers – Persistence & Uniqueness Identifiers must follow rules for valid URIs Record Datestamps – Date of last metadata record change; supports selective harvesting

6. 6 The Open Archives Initiative & NSDL 14 October 2003 t-cole3@uiuc.edu University of Illinois at UC Examples of OAI requests http://www.language-archives.org/cgi-bin/olaca3.pl?verb=Identify http://publications.uu.se/portal/OAI?verb=ListSets http://www.language-archives.org/cgi-bin/olaca3.pl? verb=ListMetadataFormats http://www.language-archives.org/cgi-bin/olaca3.pl? verb=ListIdentifiers&metadataPrefix=oai_dc&from=2002-12-01 http://www.language-archives.org/cgi-bin/olaca3.pl? verb=GetRecord&metadataPrefix=oai_dc& identifier=oai%3Aacl.sr.language-archives.org%3AA00-1006

7. 7 The Open Archives Initiative & NSDL 14 October 2003 t-cole3@uiuc.edu University of Illinois at UC An OAI Response 2002-05-01T19:20:30Z http://an.oa.org/OAI-script...

8. 8 The Open Archives Initiative & NSDL 14 October 2003 t-cole3@uiuc.edu University of Illinois at UC An OAI Record oai:arXiv:cs/0112017 2002-02-28 cs Using Structural Metadata… … ….

9. 9 The Open Archives Initiative & NSDL 14 October 2003 t-cole3@uiuc.edu University of Illinois at UC Users Collections Metadata repository The vision Services The metadata repository is a resource for service providers. It holds information about every collection and item known to the NSDL. From “The NSDL Metadata Strategy,” A presentation by William Y. Arms and Diane I. Hillman. Available: http://nsdl.comm.nsdlib.org/allprojects01/metastrategy.ppt http://nsdl.comm.nsdlib.org/allprojects01/metastrategy.ppt

10. 10 The Open Archives Initiative & NSDL 14 October 2003 t-cole3@uiuc.edu University of Illinois at UC 2.0 Specification & Related Guidelines http://www.openarchives.org/OAI/openarchivesprotocol.html OAI-PMH specification (2.0) http://www.openarchives.org/OAI/2.0/guidelines.htm OAI-PMH implementation guidelines http://www.openarchives.org/documents/FAQ.html OAI-PMH Frequently Asked Questions http://www.openarchives.org/OAI/2.0/guidelines-static-repository.htm Implementation guidelines for static repository (Beta release) [New Guidelines for expressing IP rights & usage limits in OAI in work.]

11. 11 The Open Archives Initiative & NSDL 14 October 2003 t-cole3@uiuc.edu University of Illinois at UC NSDL Metadata & OAI Resources http://metamanagement.comm.nsdl.org/outline.html NSDL Metadata Primer http://metamanagement.comm.nsdl.org/NSDL_OAI_FAQ.html http://metamanagement.comm.nsdl.org/NSDL_XML_FAQ.html http://metamanagement.comm.nsdl.org/NSDL_Encoding_FAQ.html NSDL FAQs on OAI, XML, & Encoding http://repository.comm.nsdl.org/prs_web/harvest_server_val.php NSDL OAI and metadata validation checks

12. 12 The Open Archives Initiative & NSDL 14 October 2003 t-cole3@uiuc.edu University of Illinois at UC Other Resources Online OAI tutorials: http://www.ukoln.ac.uk/metadata/oa-forum/tutorial/ OAI for Beginners, the Open Archives Forum online tutorial (UKOLN) http://dli.grainger.uiuc.edu/Publications/TWCole/JCDL-OAI/ Presented at JCDL 2003 pre-conference (5/27/2003) http://www.dlib.vt.edu/projects/OAI/reports/lita_2002_oss_oai.pdf Presented at ALA 2002, LITA OSS4LIB pre-conference (6/14/2002) OAI tools & downloadable software: http://oai.dlib.vt.edu/cgi-bin/Explorer/oai2.0/testoai OAI-PMH Repository Explorer http://www.openarchives.org/tools/tools.html Lists of downloadable OAI tools & utilities http://www.openarchives.org/tools/tools2.html XML validation tools & Unicode tools