 in the CLOS class hierarchy, though not their
subclass relationship with <span class="xmldefn">rdfs:Resource</span>. They are instances
of <span class="defn">resource-class</span>.</p>

<p class="bodytext">In the absence of any property classes,
<span class="xmldefn">owl:Thing</span> is treated as identical to <span
class="xmldefn">rdfs:Resource</span>.</p>

<p class="bodytext">Subclasses of these classes, and their slot definitions, can store
multilingual labels, corresponding to <span class="xmldefn">rdf