ubproperty-of" name="SWCLOSsubproperty-of">
<div class="titlebar">
<div class="defname">subproperty-of <i>property</i></div>
<div class="deftype">[Function]</div></div>
<div class="defdescribe">returns a direct subproperty of <i>property</i>, if exists. 
  Otherwise, cl:nil is returned. </div></p>
<h3>5.4 &nbsp;Properties and Slots </h3>
<p>In RDF, the property is the first-class entity that exists as resource. 
Therefore, the property resource exists as CLOS object, an instance of the class 
rdf:Property, 