. it can be used with or without the
 class label. Missing values are sorted at the beginning.</br>
 Can be used as comparator in the sorting and binary search algorithms of
 <code>Arrays</code> and <code>Collections</code>.
 Relational values are compared instance by instance with a nested
 InstanceComparator.</div>
<dl><dt><span class="strong">Version:</span></dt>
  <dd>$Revision: 7988 $</dd>
<dt><span class="strong">Author:</span></dt>
  <dd>FracPete (fracpete at cs dot waikato dot ac dot nz)</dd>
<dt><s