ph/graphviz.hpp</TT></a>

<h3><A NAME="concept:PropertyWriter">
<tt>PropertyWriter</tt>
</h3>

PropertyWriter is used in the <tt>write_graphviz</tt> function to
print vertex, edge or graph properties. There are two types of
PropertyWriter. One is for a vertex or edge. The other is for a graph.
Thus, users could easily extend the <tt>write_graphviz</tt> function
by creating their own <a href="./write-graphviz.html#concept:PropertyWriter">PropertyWriter</a> only.
<p>
A <a href="./write-graphviz.html#concept:P