e.STRING, Multiplicity.of(1, 1)));</b>
&nbsp;        }});
<b class="fc">&nbsp;        this.sqlgGraph.tx().commit();</b>
&nbsp;
<b class="fc">&nbsp;        Map&lt;String, PropertyDefinition&gt; properties = new HashMap&lt;&gt;();</b>
<b class="fc">&nbsp;        properties.put(&quot;ab&quot;, PropertyDefinition.of(PropertyType.STRING, Multiplicity.of(0, 1)));</b>
&nbsp;        try {
<b class="fc">&nbsp;            aVertexLabel.ensureEdgeLabelExist(&quot;ab&quot;, bVertexLabel, properties);</b>
<b class="fc">&