  <td><tt>ID</tt></td>

      <td>must be a model of <a href=
      "../property_map/doc/ReadablePropertyMap.html">ReadablePropertyMap</a> that
      maps elements to integers between zero 0 and N, the total number of
      elements in the sets.</td>

      <td><tt>boost::identity_property_map</tt></td>
    </tr>

    <tr>
      <td><tt>InverseID</tt></td>

      <td>must be a model of <a href=
      "../property_map/doc/ReadablePropertyMap.html">ReadablePropertyMap</a> that
      maps integers to elements.