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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. The SIO paper is available.

The OWL2 ontology is available at

view at

This project provides ontological support for

If you have questions please send to SIO mailing list (;

Design patterns help in defining a structure for common data types. These are currently at the old google code site

Subsets/Slims. Subsets of SIO have been prepared for modular import.