erence.sym_difference_4_with_strategy.h4"></a>
            <span class="phrase"><a name="geometry.reference.algorithms.sym_difference.sym_difference_4_with_strategy.conformance"></a></span><a class="link" href="sym_difference_4_with_strategy.html#geometry.reference.algorithms.sym_difference.sym_difference_4_with_strategy.conformance">Conformance</a>
          </h6>
<p>
            The function sym_difference implements function SymDifference from the
            <a href="http://www.opengeospatial.org/standa