 can be
          casted to a more basic tag, and then dispatched by that tag.
        </p>
<h6>
<a name="geometry.reference.core.tag_cast.h1"></a>
          <span class="phrase"><a name="geometry.reference.core.tag_cast.synopsis"></a></span><a class="link" href="tag_cast.html#geometry.reference.core.tag_cast.synopsis">Synopsis</a>
        </h6>
<p>
</p>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identi