   for the new vertex. The vertex is also added to all ancestors of
    <tt>g</tt> in the subgraph tree to maintain the subgraph property.
    (Required by <a href="VertexMutableGraph.html">VertexMutableGraph</a>.)

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<pre>
vertex_descriptor
add_vertex(vertex_descriptor u_global, subgraph&amp; g)
</pre>
Adds the vertex <i>u</i> from the root graph to the subgraph <tt>g</tt>.
(Required by <a href="VertexMutableGraph.html">VertexMutableGraph</a>.)


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<pre>
template &lt;class PropertyTag&gt;
property_ma