/// <summary>
        /// Get checkout attribute values
        /// </summary>
        /// <param name="attributesXml">Attributes in XML format</param>
        /// <returns>Checkout attribute values</returns>
        public virtual IList <CheckoutAttributeValue> ParseCheckoutAttributeValues(string attributesXml)
        {
            var values     = new List <CheckoutAttributeValue>();
            var attributes = ParseCheckoutAttributes(attributesXml);

            foreach (var attribute in attributes)
            {
                if (!attribute.ShouldHaveValues())
                {
                    continue;
                }

                var valuesStr = ParseValues(attributesXml, attribute.Id);
                foreach (string valueStr in valuesStr)
                {
                    if (!String.IsNullOrEmpty(valueStr))
                    {
                        int id;
                        if (int.TryParse(valueStr, out id))
                        {
                            var value = _checkoutAttributeService.GetCheckoutAttributeValueById(id);
                            if (value != null)
                            {
                                values.Add(value);
                            }
                        }
                    }
                }
            }
            return(values);
        }
        /// <summary>
        /// Formats attributes
        /// </summary>
        /// <param name="attributesXml">Attributes in XML format</param>
        /// <param name="customer">Customer</param>
        /// <param name="serapator">Serapator</param>
        /// <param name="htmlEncode">A value indicating whether to encode (HTML) values</param>
        /// <param name="renderPrices">A value indicating whether to render prices</param>
        /// <param name="allowHyperlinks">A value indicating whether to HTML hyperink tags could be rendered (if required)</param>
        /// <returns>Attributes</returns>
        public virtual string FormatAttributes(string attributesXml,
                                               User customer,
                                               Currency workingCurrency,
                                               string serapator     = "<br />",
                                               bool htmlEncode      = true,
                                               bool renderPrices    = true,
                                               bool allowHyperlinks = true)
        {
            var result = new StringBuilder();

            var attributes = _checkoutAttributeParser.ParseCheckoutAttributes(attributesXml);

            for (int i = 0; i < attributes.Count; i++)
            {
                var attribute = attributes[i];
                var valuesStr = _checkoutAttributeParser.ParseValues(attributesXml, attribute.Id);
                for (int j = 0; j < valuesStr.Count; j++)
                {
                    string valueStr           = valuesStr[j];
                    string formattedAttribute = "";
                    if (!attribute.ShouldHaveValues())
                    {
                        //no values
                        if (attribute.AttributeControlType == AttributeControlType.MultilineTextbox)
                        {
                            //multiline textbox
                            var attributeName = attribute.Name;
                            //encode (if required)
                            //if (htmlEncode)
                            //    attributeName = HttpUtility.HtmlEncode(attributeName);
                            formattedAttribute = string.Format("{0}: {1}", attributeName, HtmlHelper.FormatText(valueStr, false, true, false, false, false, false));
                            //we never encode multiline textbox input
                        }
                        else if (attribute.AttributeControlType == AttributeControlType.FileUpload)
                        {
                            //file upload
                            Guid downloadGuid;
                            Guid.TryParse(valueStr, out downloadGuid);
                            var download = _downloadService.GetDownloadByGuid(downloadGuid);
                            if (download != null)
                            {
                                //TODO add a method for getting URL (use routing because it handles all SEO friendly URLs)
                                string attributeText;
                                var    fileName = string.Format("{0}{1}",
                                                                download.Filename ?? download.DownloadGuid.ToString(),
                                                                download.Extension);
                                //encode (if required)
                                //if (htmlEncode)
                                //    fileName = HttpUtility.HtmlEncode(fileName);
                                if (allowHyperlinks)
                                {
                                    //hyperlinks are allowed
                                    //var downloadLink = string.Format("{0}download/getfileupload/?downloadId={1}", _webHelper.GetStoreLocation(false), download.DownloadGuid);
                                    var downloadLink = string.Empty;
                                    attributeText = string.Format("<a href=\"{0}\" class=\"fileuploadattribute\">{1}</a>", downloadLink, fileName);
                                }
                                else
                                {
                                    //hyperlinks aren't allowed
                                    attributeText = fileName;
                                }
                                var attributeName = attribute.Name;
                                //encode (if required)
                                //if (htmlEncode)
                                //    attributeName = HttpUtility.HtmlEncode(attributeName);
                                formattedAttribute = string.Format("{0}: {1}", attributeName, attributeText);
                            }
                        }
                        else
                        {
                            //other attributes (textbox, datepicker)
                            formattedAttribute = string.Format("{0}: {1}", attribute.Name, valueStr);
                            //encode (if required)
                            //if (htmlEncode)
                            //    formattedAttribute = HttpUtility.HtmlEncode(formattedAttribute);
                        }
                    }
                    else
                    {
                        int attributeValueId;
                        if (int.TryParse(valueStr, out attributeValueId))
                        {
                            var attributeValue = _checkoutAttributeService.GetCheckoutAttributeValueById(attributeValueId);
                            if (attributeValue != null)
                            {
                                formattedAttribute = string.Format("{0}: {1}", attribute.Name, attributeValue.Name);
                                if (renderPrices)
                                {
                                    decimal priceAdjustmentBase = _taxService.GetCheckoutAttributePrice(attributeValue, customer);
                                    decimal priceAdjustment     = _currencyService.ConvertFromPrimaryStoreCurrency(priceAdjustmentBase, workingCurrency);

                                    if (priceAdjustmentBase > 0)
                                    {
                                        string priceAdjustmentStr = _priceFormatter.FormatPrice(priceAdjustment, true, workingCurrency);
                                        formattedAttribute += string.Format(" [+{0}]", priceAdjustmentStr);
                                    }
                                }
                            }
                            //encode (if required)
                            //if (htmlEncode)
                            //    formattedAttribute = HttpUtility.HtmlEncode(formattedAttribute);
                        }
                    }

                    if (!String.IsNullOrEmpty(formattedAttribute))
                    {
                        if (i != 0 || j != 0)
                        {
                            result.Append(serapator);
                        }
                        result.Append(formattedAttribute);
                    }
                }
            }

            return(result.ToString());
        }