that models the <a href="PlanarEmbedding.html">PlanarEmbedding</a> 
concept.
</blockquote>

IN <tt>ForwardIterator</tt>

<blockquote>
A ForwardIterator that has <tt>value_type</tt> equal to 
<tt>graph_traits&lt;Graph&gt;::vertex_descriptor</tt>.
</blockquote>

OUT: <tt>PositionMap</tt> 

<blockquote>
A <a href="../../property_map/doc/LvaluePropertyMap.html">Writable LValue Property 
Map</a> that models the Position Map concept. The Position Map concept requires
that the value mapped to be an object that has