We need Models to describe the World (or just a single Domain). This can be done with the Resource Description Framework Schema (RDFs) or the Web Ontology Language (OWL).
Resource Description Framework Schema
Web Ontology Language
In RDFs it is defined/stated what a class really is. The Models are build up with tiny little Sentences, i.e. Facts, consisting out of Subject, Property and Object. These Facts can also be represented in a Graph Representation.
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