postconditions.</td></tr>

  <tr><td width="10%" align="left" valign="top">
  <code>@<b>invariant</b>:</code>&nbsp;... </td><td> 
    A condition which should always be true for an object.  Multiple
    <code>invariant</code> fields may be used if an object has
    multiple invariants.</td></tr>

  <!-- ========== Bibliographic Info ========== -->
  <tr><th colspan="2" align="left">Bibliographic Information</th></tr>
  <tr><td width="10%" align="left" valign="top">
  <code>@<b>author</b>:</code>&nbsp;... </