In OWL Full all data values are considered also to be part of the individual domain. In fact, in OWL Full the universe of individuals consists of all resources (owl:Thing is equivalent to rdfs:Resource).

Two OWL class identifiers are predefined, namely the classes owl:Thing and owl:Nothing. The class extension of owl:Thing is the set of all individuals. The class extension of owl:Nothing is the empty set. Consequently, every OWL class is a subclass of owl:Thing and owl:Nothing is a subclass of every class.  


    <Class rdf:ID="Thing">


        <unionOf rdf:parseType="Collection">

            <Class rdf:about="#Nothing"/>


                <complementOf rdf:resource="#Nothing"/>




Example listing





        <owl:oneOf rdf:parseType="Collection">

            <owl:Thing rdf:about="#Eurasia"/>

            <owl:Thing rdf:about="#Africa"/>

            <owl:Thing rdf:about="#NorthAmerica"/>

            <owl:Thing rdf:about="#SouthAmerica"/>

            <owl:Thing rdf:about="#Australia"/>

            <owl:Thing rdf:about="#Antarctica"/>



The RDF/XML syntax <owl:Thing rdf:about="..."/> refers to some individual (remember: all individuals are by definition instances of owl:Thing).

Other information

The class with identifier owl:Thing is the class of all individuals, and is part of OWL Lite.

Use in ISO 15926