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Version vom 9. August 2006, 17:01 Uhr

'Open Archives Initiative Protocol for Metadata Harvesting'

A low barrier interoperability specification
Based around metadata harvesting model
Metadata about resources
HTTP based
GET / POST requests
XML responses
Uses unqualified Dublin Core
Stable (OAI has committed to making subsequent revisions of the protocol backwards compatible)
Not a search protocol - that could be for example enhanced or merged versions of OpenSearch/GeoRSS and SRU/SRW besides WFS.
Implemented - among others - by Google, CiteSeer and MSN as well as by dozens of open source tools, like OAICat (Java) or mod_oai (C, installed at 500 sites); see more tools in the Weblinks section below.

There are following alternatives (Remarks: all considered either inappropriate or not established or at least 'painfull' compared to OAI-PMH):

OAI-PMH 2.0 Spec. - Specification for Open Archives Initiative Protocol for Metadata Harvesting 2.0
- OAI-PMH Implementation Guidelines
OAI-PMH Static Repository 2.0 Spec. - Specification for an OAI Static Repository and an OAI Static Repository Gateway 2.0
- Specification for an OAI Static Repository and an OAI Static Repository Gateway

For Tools and Demos see Weblinks section below.

Tutorials and short explanations:
- Concise technical description of the protocol
- OAI for beginners, OAI and OAI-PMH for absolute beginners by Philip Hunter, 2005.
Papers:
- Haixia Mao (2005), OAI-PMH Based Interoperation For Spatial Metadata. In: ISPRS Workshop on Service and Application of Spatial Data Infrastructure, XXXVI(4/W6), Oct.14-16 2005, Hangzhou, China.
- Use of OAI to disclose metadata as an output from the portal From: Go-Geo! Geo-Data Portal Project
- 'Open Content and Access for Digital Scholarship' by Gerry McKiernan, 2004 (describes use of map resources)
Software and Tools:
- OAI-PMH Data Provider Components (open source):
  - OAI tools list
  - Java: OAICat
  - PHP: hu-berlin.de, ...
- OAI-PMH Static Repository Gateways (open source):
  - srepod - OAI-PMH Static Repository Gateway (C)
- Digital Repository System Software (open source):
  - DSpace (Java)
Demos and examples:
- Demo of OAICat - The OAICat Open Source project is a Java Servlet web application providing an OAI-PMH v2.0 repository framework.
- OAIster - Most often mentioned collection of freely available, previously difficult-to-access, academically-oriented digital resources that are easily searchable by anyone.
- PKP Open Archives Harvester - Free metadata indexing system developed by the Public Knowledge Project through its federally funded efforts to expand and improve access to research.
- OJAX Demo - Federated Metasearch Service using Ajax/Lucene

@@ Zeile 12: / Zeile 12: @@
 * Not a search protocol - that could be for example enhanced or merged versions of [http://opensearch.a9.com/ OpenSearch/GeoRSS] and [http://www.loc.gov/standards/sru/ SRU/SRW] besides WFS.
 * Implemented - among others - by Google, CiteSeer and MSN as well as by dozens of open source tools, like OAICat (Java) or mod_oai (C, installed at 500 sites); see more tools in the Weblinks section below.
+There are following alternatives (Remarks: all considered either inappropriate or not established or at least 'painfull' compared to OAI-PMH):
+* Z39.50 and SRW - the more leightweight and 'modern' successor of Z39.50
+* UDDI - the SOAP thing
+* WFS - the OGC thing
 == Architecture ==