
<br/>
<h3>5.3 rdfs:subPropertyOf</h3>
<p>The properties, which are instances of rdf:Property, have super-property and 
sub-property notion, although CLOS instances do not have the super-sub relation 
on slots. Therefore, the super-sub notion upon properties is implemented in 
SWCLOS. <b>subproperty-p</b> tests the super-sub relation on property. 
<b>superproperty-of</b> and <b>subproperty-of</b> functions retrieve direct 
super-properties and sub-properties of a parameter. The detail of property is 
explai