tension function<DD><CODE>args</CODE> - The arguments of the function call.<DD><CODE>exprContext</CODE> - The context in which this expression is being executed.<DT><B>Returns:</B><DD>the return value of the function evaluation.<DT><B>Throws:</B><DD><A HREF="../../../../javax/xml/transform/TransformerException.html">TransformerException</A> - &nbsp;<DT><B>Overrides:</B><DD><A HREF="../../../../org/apache/xalan/extensions/ExtensionHandler.html#callFunction(org.apache.xpath.functions.FuncExtFunction, java.uti