Standard upper ontology (SUO) is a IEEE P1600.1 term for a near-universal upper ontology (or foundation ontology).
The following ontologies are now competing to be used as the foundation for standard:
- IFF Foundation Ontology
- Suggested Upper Merged Ontology
- OpenCyc
- Lattice of Theories including the above and
- A 4D ontology based on ISO 15926.
- The Multi-Source Ontology (MSO) brings together some of these in a practical environment.
The real progress of the standard development and discussion can be monitored at Upper Ontology Summit and in this IEEE 1600.1 SUO email archive.
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