public T byExpression() {
		ModifyExpression mx = (ModifyExpression)this.astNode;
		mx.setValue(null);
		return this.connector;
	}
public T byExpression ( ) { ModifyExpression mx = ( ModifyExpression ) this . astNode ; mx . setValue ( null ) ; return this . connector ; }
<div color='red' style="font-size:24px;color:red"><b><i>JCYPHER LANGUAGE ELEMENT</i></b></div>
<div color='red' style="font-size:18px;color:red"><i>set by an Expression which is constructed out of clauses which directly follow the <b>byExpression()</b></i></div>
<div color='red' style="font-size:18px;color:red"><i>e.g. <b>CASE .. WHEN ..</b></i></div>
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