OSGeodata metadata exchange protocol
This is part of a discussion around a geographic metadata model and an exchange protocol.
See also OSGeodataMetadataModel and generally OSGeodata.
Inhaltsverzeichnis
Overview
A protocol specification consists of requests (operations) and responses (information model encoded in a streaming format and error messages, as codes).
We distinguish specifically query/search protocols and harvesting procotols.
Protocol Approaches: Searching or Harvesting?
Geographic Metadata Harvesting Protocol approaches and specifications:
- Use HTTP and XML ('autonomous discovery')
- OAI-PMH including a comparison with WFS (profiled)
CSW, WFS and for example SRU/SRW are implementations of a search protocol. Proposals like OGC's CSW 2.0 do not fulfill these requirements. Profiled specifications like OAI-PMH or WFS are currently on our short list (see Proposals below).
Proposals
We tend to propose a harvesting approach which means, that
- in a first step data according to OSGeodataMetadataModel and encoded as XML files are published
- and in a second step OAI-PMH could be utilized, moving around the same XML files.
Better name sought (catalogue is probably not the most appropriate noun):
- Geographic Metadata Syndication Protocol (my favourite)
- Geographic Metadata Harvesting Protocol
- Other proposals?
- Geographic Data Discovery Protocol
- Geographic Metadata Dissemination Protocol
Weblinks
- Simple Catalog Interface at OSGeo Wiki as well as the OSGeodata mailing list mentioned above
- OAI-PMH - including home, wikipedia, documents, tutorials, tools and demos
- Introduction to the IESR: A Registry of Collections and Services, by Hill and Ann Apps, MIMAS, Univ. of Manchester, 2006.
- Other
- OGC's CSW 2.0
- OGC's WFS