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Handbook on Ontologies
The expressivity of RDF and RDF Schema that was described in  is deliberately very limited: RDF is (roughly) limited to binary ground predicates, and RDF Schema is (again roughly) limited to a subclass hierarchy and a property hierarchy, with domain and range definitions of these properties. However, the Web Ontology Working Group of W3C 3 identified a number of characteristic use-cases for Ontologies on the Web which would require much more expressiveness than RDF and RDF Schema. A numberdoi:10.1007/978-3-540-24750-0_4 fatcat:suxqgwwl3rgzjdn3mvsmpiaxga