# New online resource: BFO2 IS-A hierarchy

**Category:** [Specifications](https://discourse.openehr.org/c/specifications/6)
**Created:** 2022-05-09 10:55 UTC
**Views:** 410
**Replies:** 0
**URL:** https://discourse.openehr.org/t/new-online-resource-bfo2-is-a-hierarchy/2590

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## Post #1 by @thomas.beale

Dear all,
I've transferred a copy of the main BFO2 IS-A hierarchy and class descriptions [to our openEHR UML portal](https://specifications.openehr.org/releases/UML/latest/index.html#Diagrams___19_0_3_8fe028d_1652093019886_864595_5188). 

The documentation was taken from [this online copy of the BFO specification](http://gbadske.org/Files/BFO2-Reference.pdf) - it's probably a bit out of date with respect to the new ECMA standard, but I don't have a copy of the latter yet. [BFO home is here](https://basic-formal-ontology.org/).

This version of the IS-A hierarchy is a bit easier to read than the one in the spec.

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**Canonical:** https://discourse.openehr.org/t/new-online-resource-bfo2-is-a-hierarchy/2590
**Original content:** https://discourse.openehr.org/t/new-online-resource-bfo2-is-a-hierarchy/2590