   return empty.traversal();</b>
<b class="nc">&nbsp;        else if (graphData == GraphData.CLASSIC)</b>
<b class="nc">&nbsp;            return classic.traversal();</b>
<b class="nc">&nbsp;        else if (graphData == GraphData.CREW)</b>
<b class="nc">&nbsp;            throw new UnsupportedOperationException(&quot;The Crew dataset is not supported by Sqlg because it doesn&#39;t support multi/meta-properties&quot;);</b>
<b class="nc">&nbsp;        else if (graphData == GraphData.MODERN)</b>
<b class="nc">&