“Watson” is a very interesting tool that allows you to search the [Semantic] Web for semantically anotated documents containing your search items. You can use its web interface or its API to fetch results.
- Web interface: http://watson.kmi.open.ac.uk/WatsonWUI/
- “a list of URIs of semantic documents in which the keywords appear as identifiers or in literals of classes, properties, and individuals.”
For example, if you search by “Government”, you’ll get:
Ontologies and other document types will be fetched (OWL, RDF, DAML+OIL, RDF-S).
You can then navigate inside the documents do get more details:
If you navigate to “Person”, you get the ontology definition: