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OpenCyc

About Now it is even easier to use the rich and diverse collection of real-world concepts in OpenCyc to bring meaning to your semantic web applications! The full OpenCyc...
- RDF
- example/rdf+xml
schema.org

Schema.org markup schema to provide structured metadata for websites and beyond. Linked data variant provided by http://schema.rdfs.org/
- text/turtle
- JSON

You can also access this registry using the API (see API Docs).