her a certain element name is known within this namespace.
 Looks for a method with the appropriate name and signature.
 This method examines both static and instance methods.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>element</CODE> - name of the element being tested<DT><B>Returns:</B><DD>true if its known, false if not.<DT><B>Overrides:</B><DD><A HREF="../../../../org/apache/xalan/extensions/ExtensionHandler.html#isElementAvailable(java.lang.String)">isElementAvailable</A> in class <A HREF="../../../../org/a