 <B>comparator</B>()</PRE>
<DL>
<DD>Returns null since comparators are not supported.  The natural ordering
 of a stored collection is data byte order, whether the data classes
 implement the <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang"><CODE>Comparable</CODE></A> interface or not.
 This method does not conform to the <A HREF="http://download.oracle.com/javase/1.5.0/docs/api/java/util/SortedSet.html?is-external=