OWL Defines Individuals

Semantic Web Technologies: XML, RDF, OWL

You can also define individual objects in a class.

<Person rdf:ID="Adam">
  <rdfs:label>Adam</rdfs:label>
  <rdfs:comment>Adam is a person.</rdfs:comment>
  <age><xsd:integer rdf:value="13"/></age>
  <shoesize><xsd:decimal rdf:value="9.5"/></shoesize>
</Person>

Adam is a Person.