l/transform/TransformerException.html">TransformerException</A>,
                           java.io.IOException</PRE>
<DL>
<DD>Process a call to this extension namespace via an element. As a side
 effect, the results are sent to the TransformerImpl's result tree. 
 We invoke the static or instance method in the class represented by
 by the namespace URI.  If we don't already have an instance of this class,
 we create one upon the first call.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>localPart</CODE> - Element