.value</a>;</span></code></li><li id="type-block.nodes" class="def record field anchored"><a href="#type-block.nodes" class="anchor"></a><code><span><span class="keyword">mutable</span> nodes : <span><a href="#type-t">t</a> list</span>;</span></code></li></ol><code><span>}</span></code></div></div><div class="odoc-spec"><div class="spec type anchored" id="type-attr"><a href="#type-attr" class="anchor"></a><code><span><span class="keyword">and</span> attr</span><span> = </span><span>{</span></code><ol><li id