code: public NotificationChain basicSetLeftOperand(XExpression newLeftOperand, NotificationChain msgs)
  	{
  		XExpression oldLeftOperand = leftOperand;
  		leftOperand = newLeftOperand;
  		if (eNotificationRequired())
  		{
  			ENotificationImpl notification = new ENotificationImpl(this, Notification.SET, XbasePackage.XBINARY_OPERATION__LEFT_OPERAND, oldLeftOperand, newLeftOperand);
  			if (msgs == null) msgs = notification; else msgs.add(notification);
  		}
  		return msgs;
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated