Generates a URL for one item in a {@link PieDataset}. As a guideline, the URL should be valid within the context of an XHTML 1.0 document.
@param dataset the dataset (null not permitted).
@param key the item key (null not permitted).
@param pieIndex the pie index (differentiates between pies in a'multi' pie chart).
@return A string containing the URL.
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.