f the ring in case of a polygon: exterior ring (-1,
                    the default) or interior ring index
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    signed_size_type
                  </p>
                </td>
<td>
                </td>
<td>
                  <p>
                    multi_index
                  </p>
                </td>
<td>
                  <p>
                    The index of the geometry to which the points are appended
  