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This lecture explores the concept of universal ontologies aiming to model time, space, events, and relations. It delves into Wikidata, properties, queries, challenges with time, the W3C Time Ontology, and the topological relations between time intervals. The discussion extends to clocks, calendars, temporal reference systems, and ordinal temporal reference systems. The lecture also covers the CIDOC-CRM ontology, modeling of places, influence, and the property-event equivalence. It emphasizes the importance of coding time intervals instead of dates and the relativity of places. The session concludes with a summary of the work done in ontologies and a preview of constraints, rule systems, and solvers.