BF0 2020

Basic Formal Ontology 2020

BFO 2020

ISO/IEC 21838 published by ISO November 2021

Part 1 (= requirements for being a top-level ontology):

https://www.iso.org/standard/71954.html

Freely available from ISO here

https://standards.iso.org/ittf/PubliclyAvailableStandards/index.html.

Part 2 (which standardizes BFO):

https://www.iso.org/standard/74572.html

The entire formal content of BFO-2020 is available here:

https://standards.iso.org/iso-iec/21838/-2/ed-1/en/

Including

BFO 2020 OWL

BFO 2020 CL