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OAI-PMH (Open Archives Initiative Protocol for Metadata Harvesting) is a protocol developed by the Open Archives Initiative. It is used to harvest (or collect) the metadata descriptions of the records in an archive so that services can be built using metadata from many archives. An implementation of OAI-PMH must support representing metadata in Dublin Core, but may also support additional representations.
The protocol is usually just referred to as the OAI Protocol.
In the late 1990s, Herbert Van de Sompel (Ghent University) was working with researchers and librarians at Los Alamos National Laboratory (US) and called a meeting to address difficulties related to interoperability issues of e-print servers and digital repositories. The meeting was held in Santa Fe, New Mexico, in October 1999. A key development from the meeting was the definition of an interface that permitted e-print servers to expose metadata for the papers it held in a structured fashion so other repositories could identify and copy papers of interest with each other. This interface/protocol was named the "Santa Fe Convention".
Several workshops were held in 2000 at the ACM Digital Libraries conference and elsewhere to share the ideas from the Santa Fe Convention. It was discovered at the workshops that the problems faced by the e-print community were also shared by libraries, museums, journal publishers, and others who needed to share distributed resources. To address these needs, the Coalition for Networked Information and the Digital Library Federation provided funding to establish an Open Archives Initiative (OAI) secretariat managed by Herbert Van de Sompel and Carl Lagoze. The OAI held a meeting at Cornell University (Ithaca, New York) in September 2000 to improve the interface developed at the Santa Fe Convention. The specifications were refined over e-mail.
OAI-PMH version 1.0 was introduced to the public in January 2001 at a workshop in Washington D.C., and another in February in Berlin, Germany. Subsequent modifications to the XML standard by the W3C required making minor modifications to OAI-PMH resulting in version 1.1. The current version, 2.0, was released in June 2002. It contained several technical changes and enhancements and is not backward compatible.
The OAI Protocol has become widely adopted by many digital libraries, institutional repositories, and digital archives. Although registration is not mandatory, it is encouraged.
There are several large registries of OAI-compliant repositories:
- The Open Archives list of registered OAI repositories
- The OAI registry at University of Illinois at Urbana-Champaign
- The Celestial OAI registry
- Eprint’s Institutional Archives Registry
- Openarchives.eu The European Guide to OAI-PMH compliant repositories in the world
- ScientificCommons.org A worldwide service and registry
Commercial search engines have started using OAI-PMH to acquire more resources. Google is using OAI-PMH to harvest information from the National Library of Australia Digital Object Repository. In 2004, Yahoo! acquired content from OAIster (University of Michigan) that was obtained through metadata harvesting with OAI-PMH. Google did accept OAI-PMH as part of their Sitemap Protocol, though decided to stop doing so in 2008. Wikimedia uses an OAI-PMH repository to provide feeds of Wikipedia and related site updates for search engines and other bulk analysis/republishing endeavors. Especially when dealing with thousands of files being harvested every day, OAI-PMH can help in reducing the network traffic and other resource usage by doing an incremental harvesting. NASA's Mercury: Metadata Search System uses OAI-PMH to index thousands of metadata records from Global Change Master Directory (GCMD) every day.
OAI-PMH is based on a client–server architecture, in which "harvesters" request information on updated records from "repositories". Requests for data can be based on a datestamp range, and can be restricted to named sets defined by the provider. Data providers are required to provide XML metadata in Dublin Core format, and may also provide it in other XML formats.
A number of software systems support the OAI-PMH, including Fedora, GNU EPrints from the University of Southampton, Open Journal Systems from the Public Knowledge Project, Desire2Learn, DSpace from MIT, HyperJournal from the University of Pisa, Primo, DigiTool, Rosetta and MetaLib from Ex Libris, DOOR from the eLab in Lugano, Switzerland, panFMP from the PANGAEA (data library), SimpleDL from Roaring Development, and jOAI.
- Data format management
- Digital curation
- Digital preservation
- File format
- Library of Congress Digital Library project
- Dublin Core, an ISO metadata standard
- National Digital Information Infrastructure and Preservation Program
- Metadata Encoding and Transmission Standard maintained by the Library of Congress
- Preservation Metadata: Implementation Strategies (PREMIS)
- Web archiving
- Google Webmaster blog
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- R. Devarakonda, G. Palanisamy, J. Green and B. Wilson (2010). "Data sharing and retrieval uses OAI-PMH". Earth Science Informatics (Springer Berlin / Heidelberg) 4 (1): 1–5. doi:10.1007/s12145-010-0073-0
- Carl Lagoze and Herbert Van de Sompel (2001). "The Open Archives Initiative: Building a Low-Barrier Interoperability Framework". Proceedings of the first ACM/IEEE-CS Joint Conference on Digital Libraries (JCDL'01). pp. 54–62.
- Lynch, Clifford A. (2001). "Metadata harvesting and the open archives initiative". ARL Bimonthly Report 217.
- Frank McCown, Xiaoming Liu, Michael L. Nelson and Mohammed Zubair (March/April 2006). "Search Engine Coverage of the OAI-PMH Corpus". IEEE Internet Computing 10 (2): 66–73. doi:10.1109/MIC.2006.41.
- Herbert Van de Sompel and Carl Lagoze (2000). "The Santa Fe Convention of the Open Archives Initiative". D-Lib Magazine 6 (2). doi:10.1045/february2000-vandesompel-oai.
- Herbert Van de Sompel, Jeffrey A. Young, and Thomas B. Hickey (2003). "Using the OAI-PMH ... Differently". D-Lib Magazine 9 (7/8). doi:10.1045/july2003-young.
- Ranjeet Devarakonda, Giri Palanisamy, Jim Green and Bruce Wilson (2010). "Data sharing and retrieval uses OAI-PMH". Earth Science Informatics (Springer Berlin / Heidelberg) 4 (1): 1–5. doi:10.1007/s12145-010-0073-0.