lump-sum item 总价项目
The example in Listing 9 parses the shopping cart XML file and generates a bill with the individual item totals and the sum total for the purchase ( Listing 10).
清单 9 解析这个购物车 XML 文件并生成一个账单，该账单显示项目合计和采购总计（见 清单 10）。
To be concrete about it, imagine you need to recalculate the value of every inventory item on hand and sum up the total.
说得具体一点，假设您需要重新计算手头每件库存产品的价格，并计算其总和。
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