h properties that should be
emitted by the GraphML writer.</dd>
<dt>IN: <tt class="docutils literal"><span class="pre">bool</span> <span class="pre">ordered_vertices</span></tt></dt>
<dd>This tells whether or not the order of the vertices from vertices(g)
matches the order of the indexes. If <tt class="docutils literal"><span class="pre">true</span></tt>, the <tt class="docutils literal"><span class="pre">parse.nodeids</span></tt>
graph attribute will be set to <tt class="docutils literal"><span class="pre"