code: public void setOperand(XExpression newOperand)
  	{
  		if (newOperand != operand)
  		{
  			NotificationChain msgs = null;
  			if (operand != null)
  				msgs = ((InternalEObject)operand).eInverseRemove(this, EOPPOSITE_FEATURE_BASE - XbasePackage.XPOSTFIX_OPERATION__OPERAND, null, msgs);
  			if (newOperand != null)
  				msgs = ((InternalEObject)newOperand).eInverseAdd(this, EOPPOSITE_FEATURE_BASE - XbasePackage.XPOSTFIX_OPERATION__OPERAND, null, msgs);
  			msgs = basicSetOperand(newOperand, msgs);
  			if (msgs != null) msgs.dispatch();
  		}
  		else if (eNotificationRequired())
  			eNotify(new ENotificationImpl(this, Notification.SET, XbasePackage.XPOSTFIX_OPERATION__OPERAND, newOperand, newOperand));
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated