== 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