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问题陈述：在某超级市场销售管理系统中，供货员负责：（1）录入、删除、修改人/出库商品信息（商品编号，商品名称，生产厂家，数量，单价，人/出库日期）；（2）统计商品库存信息（商品编号，商品名称，库存量）前台销售员负责：（1）录入顾客选购的商品信息（商品编号，商品名称，销售量，单价）；（2）打印顾客选购的商品清单（商品编号，商品名称，销售量，销售金额）；（3）计算每次顾客购买商品的总价并收费；（4）当商品销售量大于某一限额时，给供货员发供货通知（商品编号，商品名称，进货数量）。值班经理负责：（1）统计当日商品销量信息（商品编号，商品名称，销售量，销售金额）；（2）统计当日商品库存信息（商品编号，商品名称，库存量）。 1.用结构化分析方法给出该系统的顶层DFD； 2.给出顶层DFD的数据字典； 3.选择该超级市场销售管理系统中的一个交互，并用顺序图来描述。
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