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The Semanticscience Integrated Ontology (SIO) provides a simple, integrated ontology of types and relations for rich description of objects, processes and their attributes. Have a look at a brief overview of SIO, its design principles and design patterns, and the published paper on SIO.

The OWL2 ontology is available at Subsets of SIO have been prepared for modular import.

view the ontology at

Resources that use this ontology include:

If you have questions please send to SIO mailing list (; If you have term requests, just use the issue tracker.