der will be linked automatically to the node.
  For the link to be created, the version of the node updated by
  this function must be stored in the tree afterwards,
  <a href="#store_node-2"><code>store_node/2</code></a>, as well as the child generated with the
  placeholder.</p>

<h3 class="function"><a name="get_children-2">get_children/2</a></h3>
<div class="spec">
<p><tt>get_children(Node::<a href="tree.html#type-tree_node">tree:tree_node()</a>, Tree::<a href="#type-tree">tree()</a>) -&gt; [<a href="tr