A global reverse index is simply a design where you create a map whose key is the search term, and the value is the list of keys containing an attribute with that search term.
一个全局反向索引仅仅是一个设计，其中创建的映射的键是搜索关键词，且其值是包含属性与搜索关键词的键列表。
Firstly, you can specify the index of the repeat at the time the form is first rendered by specifying an integer value for the attribute of repeat called startindex.
第一种方法：通过为被称作 startindex 的 repeat 的属性指定一个整数值，在表单第一次被呈现时，指定 repeat 的索引。
If the var attribute is specified, then a scoped variable with the indicated name will be created and assigned the current value of the index for each pass through the iteration.
如果指定了var属性，那么将会创建一个带有指定名称的并限定了作用域的变量，并将每次迭代的当前索引值赋给该变量。
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