be">Four methods are defined for this generic function: When 
<i>thing</i> is an instance of <b>iri</b>, then interned value of it is 
returned. If <i>thing</i> is an instance of <a 
href="http://www.franz.com/support/documentation/8.2/doc/classes/uri/uri.htm">net.uri:uri</a>, 
its class is changed to <b>iri</b> and interned. The interned value is returned. 
When <i>thing</i> is a string, it is interned as a uri and its class is changed 
to <b>iri</b>. Otherwise, it signals an error. </div></p>
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