从某种意义上说，您所想要的和列表上给出的是完全相反的：一个顺序不相关，但身份明确的数据结构。
What's wanted is, in a sense, the exact opposite of a list: a data structure where order is irrelevant, and identity is explicit.
比方说，如果在应用领域采用哈希表或者其他无序数据结构管理数据，可能会面临着将元素按照模式中的顺序设定重新装配的额外工作。
For example, if you manage data in hash tables or other unordered data structures in the application domain, you might face additional work re-assembling elements into the order set by a schema.
下面的案例研究展示了如何迁移这样的报告：报告作者使用的相同层次结构级别的顺序与元数据定义的顺序不同。
The following case study illustrates the migration of a report in which the report author utilizes levels from the same hierarchy in a different order than that defined by the metadata.
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