Learn
Ontology Engineering
The formal track. Everything the first course had to leave out, at the depth where you can defend it.
Start here
This is the companion to Ontology & Fabric IQ, written for someone who already models and now wants the formal apparatus. Every page opens on a claim you thought was settled, states the real result with its actual notation, then hands you a demonstration you can run yourself.
Take the first course first
These pages assume you can already define an entity, bind it, and read a graph. If any of that is new, read Ontology & Fabric IQ first. Nothing here re-teaches it.
Notation is glossed, never bare
Where a result needs real logic notation, you get the notation and a plain sentence saying what it means. Read both. The notation is what makes the claim checkable; the sentence is what makes it sayable out loud.
Run every set piece
Each page carries one interactive demonstration built to change your mind in under a minute. They are the point of the track, not decoration. Several of them contradict something the page just let you assume.
Your progress
Tick a concept here, or mark it learned on its page, and the meter fills in. Saved in this browser.
Part 1 — What an ontology is
Three chapters, no assumed knowledge. By the end you can say what the word means and defend it.