>&#160;)<span class="keyword"> const </span>{</div><div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;</div><div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;  os &lt;&lt; <span class="charliteral">&#39;p&#39;</span> &lt;&lt; node &lt;&lt; <span class="stringliteral">&quot;[label=\&quot;&quot;</span>;</div><div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;  <span class="keywordflow">if</span>(node-&gt;_name.empty()) os &lt;&l