Simplified Upper Level Ontology (SULO)

SULO offers a minimal set of classes and relations to guide the representation of knowledge in RDF/OWL.

The Ontology IRI is : https://w3id.org/sulo/

Here's the SULO Postcard showing all the classes and relations (solid line indicates connection between domain/range; dotted line indicates restriction on use in class axiom)<br> <img src="sulo-overview.png" alt="SULO Postcard" width="800">

Availability

The ontology is available in a number of formats:

• Turtle
• RDF/XML
• JSON-LD
• NTriples

You can retrieve any of these through content type negotiation

curl -L -H "Accept: text/turtle https://w3id.org/sulo
curl -L -H "Accept: application/ld+json" https://w3id.org/sulo
curl -L -H "Accept: application/rdf+xml" https://w3id.org/sulo
curl -L -H "Accept: application/n-triples" https://w3id.org/sulo

In addition, individual versions of SULO are available through the ontology IRI pattern https://w3id.org/sulo/sulo-X.X.X.ttl All versions of the ontology are available from github

Documentation

We automatically generate documentation for SULO using OntoSpy and Pylode:

• OntoSpy
• Pylode

FAIRness assessment performed with FOOPS!

Cite SULO

Michel Dumontier, Remzi Çelebi, Komal Gilani, Isabelle de Zegher, Katerina Serafimova, Catalina Martínez Costa and Stefan Schulz. SULO - a simplified upper-level ontology. Proceedings of the Joint Ontology Workshops (JOWO) - Episode XI: The Sicilian Summer under the Etna, co-located with the 15th International Conference on Formal Ontology in Information Systems (FOIS 2025), September 8-9, 2025, Catania, Italy. [Paper] [Presentation]