ke <a href="http://www.erlang.org/doc/man/dict.html#fetch-2" target="_top"><code>dict:fetch/2</code></a> but allows to specify a default value.</p>

<h3 class="function"><a name="get_child_ph-1">get_child_ph/1</a></h3>
<div class="spec">
<p><tt>get_child_ph(Tree_node::<a href="#type-tree_node">tree_node()</a>) -&gt; {<a href="#type-tree_node">tree_node()</a>, <a href="#type-tree_ph">tree_ph()</a>}</tt><br></p>
</div><p>
  Generates a placeholder for a child of the node. A child generated
  with the placehol