From semanticweb.org
<owl:Class rdf:about="#Man">
<owl:disjointWith rdf:resource="#Woman"/>
</owl:Class>
<owl:Class rdf:about="#MusicDrama">
<owl:equivalentClass>
<owl:Class>
<owl:unionOf rdf:parseType="Collection">
<owl:Class rdf:about="#Opera"/>
<owl:Class rdf:about="#Operetta"/>
<owl:Class rdf:about="#Musical"/>
</owl:unionOf>
</owl:Class>
</owl:equivalentClass>
</owl:Class>
<owl:Class rdf:about="#Opera">
<rdfs:subClassOf rdf:resource="#MusicDrama"/>
</owl:Class>
<owl:Class rdf:about="#Operetta">
<rdfs:subClassOf rdf:resource="#MusicDrama"/>
<owl:disjointWith rdf:resource="#Opera"/>
</owl:Class>
<owl:Class rdf:about="#Musical">
<rdfs:subClassOf rdf:resource="#MusicDrama"/>
<owl:disjointWith rdf:resource="#Opera"/>
<owl:disjointWith rdf:resource="#Operetta"/>
</owl:Class>
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