get rdf:type property value of resources, you may use <a 
href="#SWCLOStype-of"><b>gx:type-of</b></a> 
and <a 
href="http://www.franz.com/support/documentation/8.0/ansicl/dictentr/class-of.htm">cl:class-of</a> 
function. Note that <b>gx:type-of</b> is customized type-of function for 
resources instead of cl:type-of so that it brings RDFS semantics, but 
cl:class-of is a native function in CLOS. Therefore, while <b>gx:type-of</b> for 
rdfs:Class returns rdfs:Class in RDFS semantics, cl:class-of for rdfs:Clas