algorithms.sym_difference.sym_difference_4_with_strategy.description">Description</a>
          </h6>
<p>
            The free function symmetric difference calculates the spatial set theoretic
            symmetric difference (XOR) of two geometries.
          </p>
<h6>
<a name="geometry.reference.algorithms.sym_difference.sym_difference_4_with_strategy.h1"></a>
            <span class="phrase"><a name="geometry.reference.algorithms.sym_difference.sym_difference_4_with_strategy.synopsis"></a></span><a clas