d is unspecified.</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-dot_output"><a href="#val-dot_output" class="anchor"></a><code><span><span class="keyword">val</span> dot_output : 
  <span>string <span class="arrow">&#45;&gt;</span></span>
  <span>string <span class="arrow">&#45;&gt;</span></span>
  <span>?options:<span><a href="../../../../Utils/Dot/index.html#type-graph_style">Utils.Dot.graph_style</a> list</span> <span class="arrow">&#45;&gt;</span></span>
  <span><a href=