UKOLN is supported by: The Open Archives Initiative Protocol for Metadata Harvesting and ePrints UK AULIC Institutional Repositories Meeting University of Bristol – 23 May 2005 Andy Powell, UKOLN, University of Bath A centre of expertise in digital information management

2 Contents a brief history of OAI 10 technical things you should know about the OAI-PMH potential impact… –institutional context –the role of the library? –the researcher ePrints UK project

3 OAI roots the roots of OAI lie in the development of eprint archives… –arXiv, CogPrints, NACA (NASA), RePEc, NDLTD, NCSTRL each offered Web interface for deposit of articles and for end-user searches difficult for end-users to work across archives without having to learn multiple different interfaces recognised need for single search interface to all archives –Universal Pre-print Service (UPS)

4 Searching vs. harvesting two possible approaches to building a single search interface to multiple eprint archives… –cross-searching multiple archives based on protocol like Z39.50 –harvesting metadata into one or more ‘central’ services – bulk move data to the user-interface digital library experience in this area indicated that cross-searching not preferred approach –distributed searching of N nodes viable, but only for small values of N

5 Harvesting requirements in order that harvesting approach can work there need to be agreements about… –transport protocols – HTTP vs. FTP vs. … –metadata formats – DC vs. MARC vs. … –quality assurance – mandatory elements, mechanisms for naming of people, subjects, etc., handling duplicated records, best-practice –intellectual property and usage rights – who can do what with the records work in this area resulted in the “Santa Fe Convention”

6 Development of OAI-PMH 2 year metamorphosis thru various names –Santa Fe Convention, OAI-PMH versions 1.0, 1.1… –OAI Protocol for Metadata Harvesting 2.0 development steered by international technical committee simplicity and inter-version stability helped developer confidence move from focus on eprints to more generic protocol –move from OAI-specific metadata schema to mandatory support for Dublin Core

7 Bluffer’s guide to OAI 1.OAI-PMH short for Open Archives Initiative Protocol for Metadata Harvesting 2.a low-cost mechanism for harvesting metadata records –from ‘data providers’ to ‘service providers’ 3.allows ‘service provider’ to say ‘give me some or all of your metadata records’ –where ‘some’ is based on date-stamps, sets, metadata formats 4.eprint heritage but widely deployed –images, museum artefacts, learning objects, …

8 Bluffer’s guide to OAI 5.based on HTTP and XML –simple, Web-friendly, fast deployment 6.OAI-PMH is not a search protocol –but use can underpin search-based services based on Z39.50 or SRW or SOAP or… 7.OAI-PMH typically carries metadata –content (e.g. full-text or image) made available separately – typically at URL in metadata 8.mandates simple DC as record format –but extensible to any XML format – IEEE LOM, ONIX, MARC, METS, MPEG-21, etc.

9 Bluffer’s guide to OAI 9.metadata and ‘content’ often made freely available – but not a requirement –OAI-PMH can be used between closed groups –or, can make metadata available but restrict access to content in some way 10.underlying HTTP protocol provides –access control – e.g. HTTP BASIC –compression mechanisms (for improving performance of harvesters) –could, in theory, also provide encryption if required

10 Dublin Core OAI-PMH mandates use of simple DC as lowest common denominator agreed XML schema – ‘oai_dc’ –simple DC – 15 metadata properties –all DC properties optional and repeatable TitleContributorSource CreatorDateLanguage SubjectTypeRelation DescriptionFormatCoverage PublisherIdentifierRights

11 Impact on institutions… OAI-PMH technology provides an open, relatively stable technical framework –allows institution to re-consider management of intellectual output –greater confidence in availability of external services (e.g. discovery, access, analysis) the technical bit is easy –eprints.org software (Southampton), DSpace (MIT/HP), Fedora but, technical solutions are always easy! –real problem is cultural change required to get academics to deposit

12 Impact on libraries… library is natural choice as ‘managing agent’ for the institutional repository –quality control –metadata enhancement –preservation but technical strengths of libraries quite variable, therefore technical collaboration within institution may be required beginning to see some evidence of externally ‘hosted’ repository services being offered

13 Impact on researchers… OAI-PMH technology provides a ‘disruptive’ technical framework that supports –new ways for individual researcher to disclose his/her research output –development of new kinds of ‘research’ discovery services can use ‘personal’ OAI repository but, need to –clarify roles of institutional, discipline and personal repositories –overcome FUD – IPR, peer-review, ability to ‘publish’, quality control, inertia

14 ePrints UK RDN project funded by JISC under FAIR programme now finished but ‘service’ still running UK ‘service provider’ harvesting metadata from all UK eprint archives single point of discovery to UK eprints working with OCLC and University of Southampton to automatically enhance harvested metadata

15 ePrints UK eprint archive(s) ePrints UK OAI-PMH name authority subject classification citation analysis End-user

16 What did we learn? impact of eprint archives still quite low national coverage is potentially interesting to funders but not to end-users automatically enhancing metadata is difficult, particularly w.r.t. –subject classification –name authority approaches to metadata creation varied – no clear cataloguing guidelines –linkage to full-text from metadata record inconsistent

17

18

19

20

21 OAI and Google OAI gateway OAI gateway makes harvested metadata available to Google… eprint archive(s) HTTP OAI-PMH Examples… DSpace and Google OAIster and Yahoo

22 Current activities/issues protocol now stable and few changes being discussed some lightweight noises about re- implementing OAI-PMH using SOAP (Web services) but little enthusiasm for pushing these kinds of changes forward some work on OAI-rights issues – formalising mechanisms for attaching IPR statements and/or licences to the records being exchanged using the protocol, e.g. Creative Commons

23 Creative Commons CC is “devoted to expanding the range of creative work available for others to build upon and share” provides ‘standard’ licences for content –attribution –noncommercial –no derivative works –share alike mechanisms for indicating licence on Web pages

24 Works vs. manifestations implementers have tended to see ‘eprints’ as single-entity objects some evidence that this is too simplistic –some repositories expose metadata about the ‘work’, others expose metadata about the ‘expressions’ need more consistency in our use the OAI- PMH to expose metadata about both ‘works’ and ‘manifestations’ complex objects encoded using METS or MPEG-21 DIDL (may include ‘objects’ as well as ‘metadata about objects’)

25 Questions…