public static string ExportTaxDetails(List <Order> orders)
        {
            var xml = new StringBuilder();

            xml.Append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
            xml.Append("<orderTax>");
            foreach (var order in orders)
            {
                xml.Append("<order");
                xml.Append(" date='");
                xml.Append(Util.ToIsoDate(order.Date));
                xml.Append("'");
                xml.Append(">");
                var tax = 0D;
                foreach (var product in order.Products)
                {
                    xml.Append("<product");
                    xml.Append(" id='");
                    xml.Append(product.Id);
                    xml.Append("'");
                    xml.Append(">");
                    xml.Append(product.Name);
                    xml.Append("</product>");
                    if (product.IsEvent())
                    {
                        tax += product.Price.GetAmountInCurrency("USD") * 0.25;
                    }
                    else
                    {
                        tax += product.Price.GetAmountInCurrency("USD") * 0.175;
                    }
                }

                xml.Append("<orderTax currency='USD'>");
                if (order.Date < Util.FromIsoDate("2018-01-01T00:00Z"))
                {
                    tax += 10;
                }
                else
                {
                    tax += 20;
                }
                xml.Append($"{tax:N2}%");
                xml.Append("</orderTax>");
                xml.Append("</order>");
            }

            var totalTax = TaxCalculator.CalculateAddedTax(orders);

            xml.Append($"{totalTax:N2}%");
            xml.Append("</orderTax>");
            return(XmlFormatter.PrettyPrint(xml.ToString()));
        }
        public static string ExportFull(List <Order> orders)
        {
            var xml = new StringBuilder();

            xml.Append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
            xml.Append("<orders>");
            foreach (var order in orders)
            {
                xml.Append("<order");
                xml.Append(" id='");
                xml.Append(order.Id);
                xml.Append("'>");
                foreach (var product in order.Products)
                {
                    xml.Append("<product");
                    xml.Append(" id='");
                    xml.Append(product.Id);
                    xml.Append("'");
                    if (product.IsEvent())
                    {
                        xml.Append(" stylist='");
                        xml.Append(StylistFor(product));
                        xml.Append("'");
                    }

                    if (product.Weight > 0)
                    {
                        xml.Append(" weight='");
                        xml.Append(product.Weight);
                        xml.Append("'");
                    }

                    xml.Append(">");
                    xml.Append("<price");
                    xml.Append(" currency='");
                    xml.Append(product.Price.CurrencyCode);
                    xml.Append("'>");
                    xml.Append(product.Price.Amount);
                    xml.Append("</price>");
                    xml.Append(product.Name);
                    xml.Append("</product>");
                }

                xml.Append("</order>");
            }

            xml.Append("</orders>");
            return(XmlFormatter.PrettyPrint(xml.ToString()));
        }
        public static string ExportStore(Store store)
        {
            var xml = new StringBuilder();

            xml.Append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");

            xml.Append("<store");
            xml.Append(" name='");
            xml.Append(store.Name);
            xml.Append("'");
            xml.Append(">");
            foreach (var product in store.Stock)
            {
                xml.Append("<product");
                xml.Append(" id='");
                xml.Append(product.Id);
                xml.Append("'");
                if (product.IsEvent())
                {
                    xml.Append(" location='");
                    xml.Append(store.Name);
                    xml.Append("'");
                }
                else
                {
                    xml.Append(" weight='");
                    xml.Append(product.Weight);
                    xml.Append("'");
                }

                xml.Append(">");
                xml.Append("<price");
                xml.Append(" currency='");
                xml.Append(product.Price.CurrencyCode);
                xml.Append("'>");
                xml.Append(product.Price.Amount);
                xml.Append("</price>");
                xml.Append(product.Name);
                xml.Append("</product>");
            }

            xml.Append("</store>");

            return(XmlFormatter.PrettyPrint(xml.ToString()));
        }
        public static string ExportHistory(List <Order> orders)
        {
            var xml = new StringBuilder();

            xml.Append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
            xml.Append("<orderHistory");
            xml.Append(" createdAt='");
            var now = DateTime.Now;

            xml.Append(Util.ToIsoDate(now));
            xml.Append("'");
            xml.Append(">");
            foreach (var order in orders)
            {
                xml.Append("<order");
                xml.Append(" date='");
                xml.Append(Util.ToIsoDate(order.Date));
                xml.Append("'");
                xml.Append(" totalDollars='");
                xml.Append(order.TotalDollars());
                xml.Append("'>");
                foreach (var product in order.Products)
                {
                    xml.Append("<product");
                    xml.Append(" id='");
                    xml.Append(product.Id);
                    xml.Append("'");
                    xml.Append(">");
                    xml.Append(product.Name);
                    xml.Append("</product>");
                }

                xml.Append("</order>");
            }

            xml.Append("</orderHistory>");
            return(XmlFormatter.PrettyPrint(xml.ToString()));
        }