Datasets
- CKAN – registry of open data and content packages provided by the Open Knowledge Foundation
- DBpedia – a dataset containing extracted data from Wikipedia; it contains about 3.4 million concepts described by 1 billion triples, including abstracts in 11 different languages
- GeoNames provides RDF descriptions of more than 7,500,000 geographical features worldwide.
- UMBEL – a lightweight reference structure of 20,000 subject concept classes and their relationships derived from OpenCyc, which can act as binding classes to external data; also has links to 1.5 million named entities from DBpedia and YAGO
- FOAF – a dataset describing persons, their properties and relationships
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