Events are a recurring topic in ontological modeling and the diversity of their encoding in the semantic web ontological language OWL is immense. We provide a lightweight comparative survey of approaches to event modeling in both foundational and semantic web ontologies, and build upon it a tentative system of four categories of what is commonly called ‘event’. A substantial part of the categorization has to do with the distinction between an object and an relationship, as conceived in the lightweight ontological background modeling language PURO.
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