align="top" width="25"><img alt="[Note]" src="../../../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
              Check the <a class="link" href="../../concepts/concept_polygon.html" title="Polygon Concept">Polygon
              Concept</a> for the rules that polygon input for this algorithm
              should fulfill
            </p></td></tr>
</table></div>
<h6>
<a name="geometry.reference.algorithms.sym_difference.sym_difference_4_