">gio &lt;-<span class="st"> </span><span class="cf">function</span>(data, source, target, value, ..., </a>
<a class="sourceLine" id="cb193-3" title="3">  <span class="dt">width =</span> <span class="ot">NULL</span>, <span class="dt">height =</span> <span class="ot">NULL</span>, <span class="dt">elementId =</span> <span class="ot">NULL</span>) {</a>
<a class="sourceLine" id="cb193-4" title="4"></a>
<a class="sourceLine" id="cb193-5" title="5">  <span class="co"># ... start of the function</span></a>
<a clas