如果元素声明具有类型替换，那么将按照在模式中指定的顺序进行计算。
If an element declaration has type alternatives, they are evaluated in the order that they were specified in the schema.
定位元素声明和类型定义。
清单7 . tr： TheftReport元素和相关类型的声明。
Listing 7. Declaration of the tr: TheftReport element and related type.
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