Alternative Descriptions of Restrictions
In this book, we describe OWL and its semantics with respect to the interpretation of OWL as RDF triples as defined in the W3C OWL documents. Other characterizations have been used during the history of OWL and even appear in user interfaces of some tools. Each characterization uses its own vocabulary to describe exactly the same things. In this section we review some of the most common languages you will encounter when discussing OWL restrictions and classes, and we also provide a recommendation for best-practice terminology.
The semantics of rdfs:subClassOf and owl:equivalentClass are quite easy to characterize in terms of the inferences that hold
can be understood as a simple IF/THEN relation; if ...
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