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Introduction to ontology semantics and reasoning

I recently had the pleasure to present at the OntoSpot meeting at EBI to help my colleagues gain an intuitive understanding of ontology semantics and reasoning. In this talk I assume that you have a very basic understanding of what an ontology is, but I assume no previous knowledge wrt logic. I provide a number of examples and graphics to explain logic and description logic (DL) concepts.

Here I provide both the slides of this presentation and the link to the recording. If you have any questions or suggestions, please let me know in the comments. I have already had the very helpful suggestion for adding a reference of DL symbols, which I will do shortly.


  1. In the section on speaking about propositional logic, I accidentally said predicate logic instead of propositional logic.
  2. At the end while answering questions, I said RFD rather than RDF.

This video will also be made available at the OBO Academy.