class="anchor"></a><code><span><span class="keyword">val</span> refnum : <span><span><span class="type-var">'a</span> <a href="../../../../../../../Owl_graph/index.html#type-node">Owl_graph.node</a></span> <span class="arrow">&#45;&gt;</span></span> int</span></code></div><div class="spec-doc"><p>return the reference number of the given node</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-node_shape"><a href="#val-node_shape" class="anchor"></a><code><span><span class="keyword