code: public UTerminal on(JcNode node) {
  		UsingExpression ux = (UsingExpression)this.astNode;
  		ux.setValueRef(node);
  		UTerminal ret = new UTerminal(ux);
  		return ret;
  	}
docs: <div color='red' style="font-size:24px;color:red"><b><i><u>JCYPHER</u></i></b></div>
  <div color='red' style="font-size:18px;color:red"><i>select the identifier for the resulting nodes of the label scan</i></div>
  <div color='red' style="font-size:18px;color:red"><i>e.g. USING.LABEL_SCAN("German").<b>on(n)</b></i></div>
  <br/>