'''ISO/IEC 21838 Information technology — Top-level ontologies (TLO)'''

::Part 1: [https://www.iso.org/standard/71954.html Requirements]

::Part 2: [https://www.iso.org/standard/74572.html Basic Formal Ontology (BFO)]

[https://standards.iso.org/iso-iec/21838/-2/ed-1/en/ ISO Standards Maintenance Portal]

[https://basic-formal-ontology.org/users.html Users of BFO]

[http://ncorwiki.buffalo.edu/index.php/BFO_2020 Links to contents of Parts 1 and 2]