NED"><CODE>DatatypeConstants.FIELD_UNDEFINED</CODE></A> indicates optional field is not set.<DT><B>Returns:</B><DD><code>XMLGregorianCalendar</code> created from parameter values.<DT><B>Throws:</B><DD><CODE>java.lang.IllegalArgumentException</CODE> - If any individual parameter's value is outside the maximum value constraint for the field
   as determined by the Date/Time Data Mapping table in <A HREF="../../../javax/xml/datatype/XMLGregorianCalendar.html"><CODE>XMLGregorianCalendar</CODE></A>
   or if the 