Ontologies classifying and describing services are called service ontologies. The currently used WSDL interface describes a service by specifying the operation name, inputs required for the service invocation, output of the service and its target address for invocation. Human intervention is required in this loop since the current architecture only addresses the syntactical aspects of Web services and lacks choreography mechanisms.
Ping the Semantic Web, the repository for RDF documents, has a page that lists every namespace they've come across as well as the number of references to each namespace. I've listed the top 20 namespaces and the number of references to each. It's interesting to see the sharp drop in references once you get past the top 5. Each of the links below point to a Zitgist Browser page for that namespace so that you can explore them further.
Published 9 years ago by James Simmons
It seems as though nothing short of a new buzzword can stop the burst of activity in the vertical search market, and who are we to complain? Vertical search engines differ from their horizontal brethren (who attempt to index the Web as a whole) by focusing on a single topic or niche about which to index information from the Web. Often, a VSE can deliver results with much greater relevancy and accuracy than major horizontal players like Google, Yahoo, and Microsoft.
Swoogle describes itself as being the search engine for the Semantic Web. Swoogle crawls the web looking for RDF documents. At this time Swoogle offers the these services:
- Search ontologies and instance data
- Search terms (URIs that have been defined as classes and properties)
- Provide metadata of Semantic Web documents
- Support browsing the Semantic Web
- Archive different versions of Semantic Web documents
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