Foundations for Ontology by John Sowa.
A highly amusing combination of recent slides by John Sowa on issues surrounding the use and construction of ontologies.
I particularly enjoyed slide 4 Prospects for a Universal Ontology: Attempts to create a universal classification of concepts which lists just the highlights of attempts at universal classification systems.
Lots of references to other Sowa presentations/publications. And others.
Which slide do you like best?
FYI, my test for any ontology is its usefulness for some specified purpose. That allows us to clear away all the factionalism over notation, foundations, and most theoretical issues. The remaining questions are: What do you want to do?, How does this ontology help you do it?, What will it cost?. Those are empirical questions that don’t require a review of Western Civilization to answer.