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Disjoint Union

A professor can either be active or retired but not both at the same time.

<owl:Class rdf:about="#Professor">
 <rdfs:subClassOf>
  <owl:unionOf rdf:parseType="Collection">
   <owl:Class rdf:about="#Active"/>
   <owl:Class rdf:about="#Retired"/>
  </owl:unionOf>
 </rdfs:subClassOf>
</owl:Class>

RDF/XML Syntax

Class: Professor   DisjointUnionOf: Active, Retired 

Manchester Syntax
:Professor  rdfs:subClassOf
[
rdf:type            owl:Class ;
owl:DisjoinUnionOf  ( :Active :Retired )
] .
Turtle Syntax

Speaker notes:

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