e of a <code>Duration</code>
 specifying the <code>Duration</code> as isPositive, years, months, days, hours, minutes, seconds.</p>
 
 <p>A <A HREF="../../../javax/xml/datatype/DatatypeConstants.html#FIELD_UNDEFINED"><CODE>DatatypeConstants.FIELD_UNDEFINED</CODE></A> value indicates that field is not set.</p><DD><DL>
<DT><B>Parameters:</B><DD><CODE>isPositive</CODE> - Set to <code>false</code> to create a negative duration. When the length
   of the duration is zero, this parameter will be ignored.<DD><CODE