e.returns"></a></span><a class="link" href="is_valid_2_with_failure_value.html#geometry.reference.algorithms.is_valid.is_valid_2_with_failure_value.returns">Returns</a>
          </h6>
<p>
            Returns true if the geometry is valid (in the OGC sense); furthermore,
            the following geometries are considered valid: multi-geometries with
            no elements, linear geometries containing spikes, areal geometries with
            duplicate (consecutive) points
          </p>
<h6>
<a name="geo