ce>gx-user(22): (put-value MyResource myProp 
"added 1st")<br/>("added 2nd" "added 1st" "original one")<br/>gx-user(23): 
(slot-value MyResource 'myProp)<br/>("added 2nd" "added 1st" "original 
one")<br/></code><br/>
<h3>5.8 &nbsp;Adding Multiple Types </h3>
<p>A CLOS object belongs to only one class. However, an instance in RDF may be a 
member of multiple classes. In order to solve this problem, we set up an 
invisible class that is an instance of metaclass <b>gx::shadowed-class</b>. For 
example, suppose